The physics of star formation
... recent decades that we have begun to gain some physical understanding of how this happens. Observations at many wavelengths, especially radio and infrared, have led to great advances in our knowledge of the subject, and the observational study of star formation is now a large and active field of res ...
... recent decades that we have begun to gain some physical understanding of how this happens. Observations at many wavelengths, especially radio and infrared, have led to great advances in our knowledge of the subject, and the observational study of star formation is now a large and active field of res ...
SkyWatcher2017.5 1.3 Mb - Boise Astronomical Society
... luminosity distance of DL = 749 mega-parsecs may be calculated from z. It is also one of the most luminous quasars known, with an absolute magnitude of −26.7, meaning that if it were only as distant as Pollux it would appear nearly as bright in the sky as the Sun. Since the sun's absolute magnitude ...
... luminosity distance of DL = 749 mega-parsecs may be calculated from z. It is also one of the most luminous quasars known, with an absolute magnitude of −26.7, meaning that if it were only as distant as Pollux it would appear nearly as bright in the sky as the Sun. Since the sun's absolute magnitude ...
The physics of star formation - Yale Astronomy
... recent decades that we have begun to gain some physical understanding of how this happens. Observations at many wavelengths, especially radio and infrared, have led to great advances in our knowledge of the subject, and the observational study of star formation is now a large and active field of res ...
... recent decades that we have begun to gain some physical understanding of how this happens. Observations at many wavelengths, especially radio and infrared, have led to great advances in our knowledge of the subject, and the observational study of star formation is now a large and active field of res ...
environmental effects on galaxy evolution in nearby clusters
... The environmental effects on galaxy evolution in nearby clusters are investigated using a multiwavelength dataset. The present analysis is focused on the properties of three (Abell 1367, Virgo and Coma) among the best studied clusters in the local Universe. Due to the variety of their environmental ...
... The environmental effects on galaxy evolution in nearby clusters are investigated using a multiwavelength dataset. The present analysis is focused on the properties of three (Abell 1367, Virgo and Coma) among the best studied clusters in the local Universe. Due to the variety of their environmental ...
The Life and Work of Edward Emerson Barnard
... larger scale of the Bruce telescope, and in the search for diffused nebulosities Barnard exposed a large number of plates on the upper part of the Scorpion. 63 Many of the plates, by chance, recorded the trails of faint asteroids, and on three plates exposed on July 22, 1905, he recorded the trail o ...
... larger scale of the Bruce telescope, and in the search for diffused nebulosities Barnard exposed a large number of plates on the upper part of the Scorpion. 63 Many of the plates, by chance, recorded the trails of faint asteroids, and on three plates exposed on July 22, 1905, he recorded the trail o ...
The redshift of extragalactic nebulae
... spheroid, often elliptical, and many of them have a spiral-like appearance, for which reason they are sometimes designated as spiral nebulae. Thanks to the enormous resolving power of modern giant telescopes, it was possible to determine that these nebulae lie outside the boundaries of our own Milky ...
... spheroid, often elliptical, and many of them have a spiral-like appearance, for which reason they are sometimes designated as spiral nebulae. Thanks to the enormous resolving power of modern giant telescopes, it was possible to determine that these nebulae lie outside the boundaries of our own Milky ...
The physics of star formation
... the result is that molecular clouds are very cold and have typical temperatures of only about 10–20 K. Higher temperatures of up to 100 K or more may exist locally in regions heated by luminous newly formed stars. In typical molecular clouds, cooling is due mostly to the emission of far-infrared rad ...
... the result is that molecular clouds are very cold and have typical temperatures of only about 10–20 K. Higher temperatures of up to 100 K or more may exist locally in regions heated by luminous newly formed stars. In typical molecular clouds, cooling is due mostly to the emission of far-infrared rad ...
Multiplicity in Early Stellar Evolution
... Connelley et al. (2009) found that of 47 protostars observed with adaptive optics, every target with a close companion has another young star within a projected separation of 25,000 AU. The study of even closer companions to protostars is still in its infancy. In a pilot program, Viana Almeida et al ...
... Connelley et al. (2009) found that of 47 protostars observed with adaptive optics, every target with a close companion has another young star within a projected separation of 25,000 AU. The study of even closer companions to protostars is still in its infancy. In a pilot program, Viana Almeida et al ...
Quiescent and flaring X-ray emission from the nearby M/T dwarf
... dwarf, comparable in distance to the famous T dwarf binary orbiting Indi (McCaughrean et al. 2004). Follow-up observations performed in 2005 had shown SCR 1845 to be a late-type dwarf binary that consists of an M 8.5 dwarf with a T 5.5 dwarf secondary, as deduced from IR observation with the VLT/N ...
... dwarf, comparable in distance to the famous T dwarf binary orbiting Indi (McCaughrean et al. 2004). Follow-up observations performed in 2005 had shown SCR 1845 to be a late-type dwarf binary that consists of an M 8.5 dwarf with a T 5.5 dwarf secondary, as deduced from IR observation with the VLT/N ...
preprint, pdf version - LESIA
... events observed in Brazil and Chile (4 June 2011) and in Hawaii (23 June 2011). These last two events, as in 22 June 2008, were double events in which Charon and Pluto occulted the same star. In the 4 June 2011 event in particular, both occultations could be recorded at each site. The population of ...
... events observed in Brazil and Chile (4 June 2011) and in Hawaii (23 June 2011). These last two events, as in 22 June 2008, were double events in which Charon and Pluto occulted the same star. In the 4 June 2011 event in particular, both occultations could be recorded at each site. The population of ...
Lecture 2
... Completing the z~3 Picture • Using molecular line emission at z=3, could probe cool gas • “low-excitation lines will map out a larger fraction of the ISM in these galaxies and…study in detail the spacially resolved kinematic structure of most of the gas…which resides in the cold phase” (Carilli & B ...
... Completing the z~3 Picture • Using molecular line emission at z=3, could probe cool gas • “low-excitation lines will map out a larger fraction of the ISM in these galaxies and…study in detail the spacially resolved kinematic structure of most of the gas…which resides in the cold phase” (Carilli & B ...
Unlocking the secrets of stellar haloes using combined star counts
... Accepted 2011 November 29. Received 2011 November 5; in original form 2010 September 16 ...
... Accepted 2011 November 29. Received 2011 November 5; in original form 2010 September 16 ...
Hot Horizontal Branch Stars in the Galactic Bulge. I
... These are mostly cool or warm BHB’s (Moehler, Sweigart, & Catelan 1999), with few if any of the hottest, faintest types, the subdwarf sdB stars and their relatively rare successors the sdO stars. Surprisingly, significant numbers of sdB/O’s are found in metal-rich populations in the Milky Way; even ...
... These are mostly cool or warm BHB’s (Moehler, Sweigart, & Catelan 1999), with few if any of the hottest, faintest types, the subdwarf sdB stars and their relatively rare successors the sdO stars. Surprisingly, significant numbers of sdB/O’s are found in metal-rich populations in the Milky Way; even ...
Science with the Constellation
... A major goal of science is to understand how our Universe arrived at its present state and to understand its ultimate destiny. Over the past decade, astronomy has been revolutionized by observing with large ground-based telescopes, such as the 10 m Keck Observatory, and by observing from space, away ...
... A major goal of science is to understand how our Universe arrived at its present state and to understand its ultimate destiny. Over the past decade, astronomy has been revolutionized by observing with large ground-based telescopes, such as the 10 m Keck Observatory, and by observing from space, away ...
Properties of Wolf-Rayet Stars - Paul Crowther, University of Sheffield
... intrinsically weak emission lines. For example, HD 93131 (WN6ha) has a He ii λ4686 emission equivalent width which is an order of magnitude smaller than that observed in other WN6 stars; the ‘ha’ nomenclature indicates that hydrogen is seen both in absorption and emission. From a standard spectrosco ...
... intrinsically weak emission lines. For example, HD 93131 (WN6ha) has a He ii λ4686 emission equivalent width which is an order of magnitude smaller than that observed in other WN6 stars; the ‘ha’ nomenclature indicates that hydrogen is seen both in absorption and emission. From a standard spectrosco ...
Stars, Galaxies, and Beyond
... I have prepared this summary to assist in learning some of the materials relevant to the courses named. These 300–level (junior) college courses have provided a satisfying opportunity to take a more detailed but still manageable look at astronomy and astrophysics applying to space well beyond the so ...
... I have prepared this summary to assist in learning some of the materials relevant to the courses named. These 300–level (junior) college courses have provided a satisfying opportunity to take a more detailed but still manageable look at astronomy and astrophysics applying to space well beyond the so ...
Stellarium User Guide - Skolekonsulenterne.dk
... planetarium. It will calculate the positions of the Sun and Moon, planets and stars, and draw how the sky would look to an observer depending on their location and the time. It can also draw the constellations and simulate astronomical phenomena such as meteor showers, and solar or lunar eclipses. S ...
... planetarium. It will calculate the positions of the Sun and Moon, planets and stars, and draw how the sky would look to an observer depending on their location and the time. It can also draw the constellations and simulate astronomical phenomena such as meteor showers, and solar or lunar eclipses. S ...
Distance determination for RAVE stars using stellar models
... (see, for example, the reviews of Gautschy & Saio 1995, 1996). These have been used effectively to probe the structure of our Galaxy, in particular the study of the old and relatively metalpoor RR Lyrae stars (Vivas et al. 2001; Kunder & Chaboyer 2008; Watkins et al. 2009). Although pulsating variabl ...
... (see, for example, the reviews of Gautschy & Saio 1995, 1996). These have been used effectively to probe the structure of our Galaxy, in particular the study of the old and relatively metalpoor RR Lyrae stars (Vivas et al. 2001; Kunder & Chaboyer 2008; Watkins et al. 2009). Although pulsating variabl ...
Astronomers` Observing Guides
... called them) with others. Their unexpected beauty typically brings gasps of astonishment and delight from first-time observers as they peer into the eyepiece. Many double star aficionados can trace their lifelong love affair with these objects to just such an encounter. Experiences like those above of ...
... called them) with others. Their unexpected beauty typically brings gasps of astonishment and delight from first-time observers as they peer into the eyepiece. Many double star aficionados can trace their lifelong love affair with these objects to just such an encounter. Experiences like those above of ...
Observational evidence for AGN feedback in early
... 200 km s−1 ) and roughly evenly distributed between star formation and AGN at intermediate and low (σ < 100 km s−1 ) masses. The objects with emission (∼20 per cent) are offset from the red sequence and form a well-defined pattern in the colour–mass diagram. Star-forming early-types inhabit the blue ...
... 200 km s−1 ) and roughly evenly distributed between star formation and AGN at intermediate and low (σ < 100 km s−1 ) masses. The objects with emission (∼20 per cent) are offset from the red sequence and form a well-defined pattern in the colour–mass diagram. Star-forming early-types inhabit the blue ...
ASI 2017 Abstract Book - Astronomical Society of India
... Dibyendu Nandi - The Science Case for Solar and Space Weather Observations from Lagrange Point L5 in Space Vipin K. Yadav - Solar plasma (Alfven) wave observation at L1 point with the magnetic field measurements Mekhi Dhesi - Twinkle Space Mission Mahendra Verma - How MHD Turbulence theories can hel ...
... Dibyendu Nandi - The Science Case for Solar and Space Weather Observations from Lagrange Point L5 in Space Vipin K. Yadav - Solar plasma (Alfven) wave observation at L1 point with the magnetic field measurements Mekhi Dhesi - Twinkle Space Mission Mahendra Verma - How MHD Turbulence theories can hel ...
The Life Cycle of Stars: Supernovae in Starbursts by Jason Kezwer
... in the nuclear regions of Arp 220 to lie between 2.01 ≤ AK ≤ 3.40 or 17.95 ≤ AV ≤ 30.36 in the optical, in agreement with several other estimates. Improved resolution is required in order to detect supernovae in the extremely bright nuclear environments of LIRGs. Alternatively, infrared spectroscopy ...
... in the nuclear regions of Arp 220 to lie between 2.01 ≤ AK ≤ 3.40 or 17.95 ≤ AV ≤ 30.36 in the optical, in agreement with several other estimates. Improved resolution is required in order to detect supernovae in the extremely bright nuclear environments of LIRGs. Alternatively, infrared spectroscopy ...
Pulsed Accretion in the Young Binary &
... or a substantial change in photospheric spectra. These stars become bluer and have increasing W (H a) as they fade. ...
... or a substantial change in photospheric spectra. These stars become bluer and have increasing W (H a) as they fade. ...
Discovery of White Dwarfs—1 Oct • Adams’ discovery
... • How much smaller is Sirius B? • Apparent mag of Sirius A is −1.5 • Apparent mag of Sirius B is 8.7 ...
... • How much smaller is Sirius B? • Apparent mag of Sirius A is −1.5 • Apparent mag of Sirius B is 8.7 ...
SPICA Yellow Book
... cooled to cryogenic temperatures to achieve high sensitivity and, for most of the frequency range, the observations can only be made from space. Only four small space observatories have operated in the past quarter of a century (IRAS, ISO, Spitzer and AKARI), offering limited spatial resolution and ...
... cooled to cryogenic temperatures to achieve high sensitivity and, for most of the frequency range, the observations can only be made from space. Only four small space observatories have operated in the past quarter of a century (IRAS, ISO, Spitzer and AKARI), offering limited spatial resolution and ...
Serpens
Serpens (""the Serpent"", Greek Ὄφις) is a constellation of the northern hemisphere. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations defined by the International Astronomical Union. It is unique among the modern constellations in being split into two non-contiguous parts, Serpens Caput (Serpent's Head) to the west and Serpens Cauda (Serpent's Tail) to the east. Between these two halves lies the constellation of Ophiuchus, the ""Serpent-Bearer"". In figurative representations, the body of the serpent is represented as passing behind Ophiuchus between Mu Serpentis in Serpens Caput and Nu Serpentis in Serpens Cauda.The brightest star in Serpens is the red giant star Alpha Serpentis, or Unukalhai, in Serpens Caput, with an apparent magnitude of 2.63. Also located in Serpens Caput are the naked-eye globular cluster Messier 5 and the naked-eye variables R Serpentis and Tau4 Serpentis. Notable extragalactic objects include Seyfert's Sextet, one of the densest galaxy clusters known; Arp 220, the prototypical ultraluminous infrared galaxy; and Hoag's Object, the most famous of the very rare class of galaxies known as ring galaxies.Part of the Milky Way's galactic plane passes through Serpens Cauda, which is therefore rich in galactic deep-sky objects, such as the Eagle Nebula (IC 4703) and its associated star cluster Messier 16. The nebula measures 70 light-years by 50 light-years and contains the Pillars of Creation, three dust clouds that became famous for the image taken by the Hubble Space Telescope. Other striking objects include the Red Square Nebula, one of the few objects in astronomy to take on a square shape; and Westerhout 40, a massive nearby star-forming region consisting of a molecular cloud and an H II region.