Comparing stars - The Open University
... than the Sun, and appears bluish-white. It has the greatest apparent visual brightness (most negative apparent visual magnitude!) of any star in the night sky. This is, as we have seen, not because it is very luminous, but because it is both fairly luminous and rather close - at 2.63 pc it's the sev ...
... than the Sun, and appears bluish-white. It has the greatest apparent visual brightness (most negative apparent visual magnitude!) of any star in the night sky. This is, as we have seen, not because it is very luminous, but because it is both fairly luminous and rather close - at 2.63 pc it's the sev ...
Stellarium User Guide - Skolekonsulenterne.dk
... 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. Stellarium may be used as an educational tool for teaching about the night sky, as an obse ...
... 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. Stellarium may be used as an educational tool for teaching about the night sky, as an obse ...
to - NexStar Resource Site
... can both be found in the constellation Ursa Major. Both are estimated to be about 12 million ly’s distant (or more) and come in at about 6.9 & 8.4 mag. respectively. It is believed that a few tens of million years ago, which is semi-recently on the cosmic time scale, a close encounter occurred betwe ...
... can both be found in the constellation Ursa Major. Both are estimated to be about 12 million ly’s distant (or more) and come in at about 6.9 & 8.4 mag. respectively. It is believed that a few tens of million years ago, which is semi-recently on the cosmic time scale, a close encounter occurred betwe ...
preprint, pdf version - LESIA
... ideal in the case of TNOs. In contrast to Pluto occultations, for TNOs we obtain good contrast in the light curves using very modest instruments for stars as faint as R = 18.0, as verified in the recent successfully recorded TNO occultations reported here. This is due to the TNO magnitudes being muc ...
... ideal in the case of TNOs. In contrast to Pluto occultations, for TNOs we obtain good contrast in the light curves using very modest instruments for stars as faint as R = 18.0, as verified in the recent successfully recorded TNO occultations reported here. This is due to the TNO magnitudes being muc ...
POSTERS SESSION I: Atmospheres of Massive Stars
... be directly measured from the Doppler broadening of their photospheric lines. In Wolf-Rayet (WR) stars, however, such measurements are impossible, since their continuum emission is formed in the dense wind that hides the hydrostatic, stellar surface. Here, we present a technique to derive the rotati ...
... be directly measured from the Doppler broadening of their photospheric lines. In Wolf-Rayet (WR) stars, however, such measurements are impossible, since their continuum emission is formed in the dense wind that hides the hydrostatic, stellar surface. Here, we present a technique to derive the rotati ...
12-1 - Piscataway High School
... visual magnitude a star would have if it were 10 pc away as its absolute visual magnitude (MV). This is an expression of the intrinsic brightness of the star. The symbol for absolute visual magnitude is a capital M with a subscript V. The subscript reminds you it is a visual magnitude based only on ...
... visual magnitude a star would have if it were 10 pc away as its absolute visual magnitude (MV). This is an expression of the intrinsic brightness of the star. The symbol for absolute visual magnitude is a capital M with a subscript V. The subscript reminds you it is a visual magnitude based only on ...
Distance determination for RAVE stars using stellar models
... 2001) will observe up to 109 stars with exquisite astrometric precision. The mission is due to start in 2012, but a final data release will not arrive until near the end of the decade at the earliest. Furthermore, as with any such magnitude limited survey, there will be a significant proportion of s ...
... 2001) will observe up to 109 stars with exquisite astrometric precision. The mission is due to start in 2012, but a final data release will not arrive until near the end of the decade at the earliest. Furthermore, as with any such magnitude limited survey, there will be a significant proportion of s ...
Star Formation in the Rosette Complex
... unique: The nebula itself is usually cataloged as NGC 2237 or NGC 2246 (especially by amateur observers), although NGC 2237 originally referred to the brightest patch at its western side and NGC 2246 originally pointed to a bright zone at the eastern side. In addition, while the central cluster is u ...
... unique: The nebula itself is usually cataloged as NGC 2237 or NGC 2246 (especially by amateur observers), although NGC 2237 originally referred to the brightest patch at its western side and NGC 2246 originally pointed to a bright zone at the eastern side. In addition, while the central cluster is u ...
Rotation Periods of Wide Binaries in the Kepler Field
... these clusters are relatively distant, so cluster stars later than early K spectral type are too faint for Kepler. Angus, et al. (2015) used rotation periods of Kepler stars as well as cluster stars and other stars with known ages to derive a period-age-color relation of the form P = aAn (B − V − c) ...
... these clusters are relatively distant, so cluster stars later than early K spectral type are too faint for Kepler. Angus, et al. (2015) used rotation periods of Kepler stars as well as cluster stars and other stars with known ages to derive a period-age-color relation of the form P = aAn (B − V − c) ...
21_Testbank
... light but extraordinary when they are observed in infrared light. Answer: Starburst galaxies are filled with star-forming molecular clouds, which contain dust grains that absorb most of the visible light produced by the young stars. This radiation heats the dust grains to very high temperatures, and ...
... light but extraordinary when they are observed in infrared light. Answer: Starburst galaxies are filled with star-forming molecular clouds, which contain dust grains that absorb most of the visible light produced by the young stars. This radiation heats the dust grains to very high temperatures, and ...
FIRST STELLAR ABUNDANCES IN THE DWARF IRREGULAR
... 2002. For the best candidates, the ESI low-resolution spectra were complemented by high-resolution spectra taken with UVES in the April 2002 visitor run. All candidates stars were first checked for their membership to the Sextans A galaxy by comparing the measured radial velocities of the stars to t ...
... 2002. For the best candidates, the ESI low-resolution spectra were complemented by high-resolution spectra taken with UVES in the April 2002 visitor run. All candidates stars were first checked for their membership to the Sextans A galaxy by comparing the measured radial velocities of the stars to t ...
2 The Concept of “Spectral Classes”
... All stars including the standards are peculiar at some level. Hence, the most complicated part of any classification system is the array of spectral peculiarities, usually designated by a single letter or character. The descriptions of these attributes, P1P2P3P4, each of which has a value in the ran ...
... All stars including the standards are peculiar at some level. Hence, the most complicated part of any classification system is the array of spectral peculiarities, usually designated by a single letter or character. The descriptions of these attributes, P1P2P3P4, each of which has a value in the ran ...
Avtar Krishen Kaul
... So why did the Rishis not name those months as Mesha etc. rashis simultaneously as is done these days, at least by Western astronomers, who follow a seasonal year/calendar, just like the Vedic Rishis did, and name those months as Aries, Taurus etc.? Believe me, however, our Rishis were geniuses not ...
... So why did the Rishis not name those months as Mesha etc. rashis simultaneously as is done these days, at least by Western astronomers, who follow a seasonal year/calendar, just like the Vedic Rishis did, and name those months as Aries, Taurus etc.? Believe me, however, our Rishis were geniuses not ...
Sample pages 1 PDF
... An attentive observer will soon notice that individual bright stars that are rather close together in the sky seem to form simple geometric shapes – squares, rhombuses, crosses, circles, arches. Giving a name to these shapes in the sky makes them more familiar to you and easier to locate again. That ...
... An attentive observer will soon notice that individual bright stars that are rather close together in the sky seem to form simple geometric shapes – squares, rhombuses, crosses, circles, arches. Giving a name to these shapes in the sky makes them more familiar to you and easier to locate again. That ...
a wide-field survey for variable stars
... The orange star at the center of the image is T Tauri, prototype of the class of T Tauri variable stars. The nearby dusty, yellow cloud is Hind’s Variable Nebula (NGC 1555/1554). Over 400 light-years away, at the edge of a molecular cloud, both star and nebula are seen to vary significantly in brigh ...
... The orange star at the center of the image is T Tauri, prototype of the class of T Tauri variable stars. The nearby dusty, yellow cloud is Hind’s Variable Nebula (NGC 1555/1554). Over 400 light-years away, at the edge of a molecular cloud, both star and nebula are seen to vary significantly in brigh ...
Astronomy Astrophysics Circumstellar emission in Be/X-ray binaries of the Magellanic
... 1998). These stars are surrounded by a circumstellar envelope that profoundly alters the emerging spectrum. Spectra of Be stars show some essential characteristics. 1) The Balmer lines are affected by the emission that is produced by bound-bound transitions in the envelope, which fills in the photos ...
... 1998). These stars are surrounded by a circumstellar envelope that profoundly alters the emerging spectrum. Spectra of Be stars show some essential characteristics. 1) The Balmer lines are affected by the emission that is produced by bound-bound transitions in the envelope, which fills in the photos ...
Red supergiants and the past of Cygnus OB2
... Mengel & Tacconi-Garman 2007). At the same time, their presence and characteristics would set relevant lower limits on the past massive star formation activity of the region. In this paper we report on seven red supergiants located within or near the boundaries of Cygnus OB2 and consistent with bein ...
... Mengel & Tacconi-Garman 2007). At the same time, their presence and characteristics would set relevant lower limits on the past massive star formation activity of the region. In this paper we report on seven red supergiants located within or near the boundaries of Cygnus OB2 and consistent with bein ...
A Star - Cloudy Nights
... stars, with the rest being extremely faint or extremely close to each other. Almaak, or Gamma Andromeda is a quadruple star system. The two bright stars you can see are each double stars. They lie approximately 260 light years away. The separation between the brighter stars is about 800 A.U. The f ...
... stars, with the rest being extremely faint or extremely close to each other. Almaak, or Gamma Andromeda is a quadruple star system. The two bright stars you can see are each double stars. They lie approximately 260 light years away. The separation between the brighter stars is about 800 A.U. The f ...
Stars: Intro & Classification Astronomy 1 — Elementary Astronomy LA Mission College
... We intentionally do not suggest that there is a simple mechanism for accomplishing this and we avoid the concept of filters. ...
... We intentionally do not suggest that there is a simple mechanism for accomplishing this and we avoid the concept of filters. ...
Planetary Nebulae: Observational Properties, Mimics, and Diagnostics
... By definition, a PN surrounds a hot, low-mass CS, which may in fact be off-centre in some old examples due to an asymmetric ISM interaction (see Wareing 2010, and Sabin et al. 2010, in this issue). The CS has a temperature of at least 20,000 K (up to ∼250,000 K), and a mass between the empirical lim ...
... By definition, a PN surrounds a hot, low-mass CS, which may in fact be off-centre in some old examples due to an asymmetric ISM interaction (see Wareing 2010, and Sabin et al. 2010, in this issue). The CS has a temperature of at least 20,000 K (up to ∼250,000 K), and a mass between the empirical lim ...
Chemical abundances and winds of massive stars in M31: a Btype
... (1987), although little quantitative analysis has been carried out to date. The only detailed studies of Wolf – Rayet stars beyond the Magellanic Clouds have been studies of late WN stars in M33 by Smith et al. (1995) and Crowther et al. (1997). Bianchi et al. (1996b) have published UV spectroscopy ...
... (1987), although little quantitative analysis has been carried out to date. The only detailed studies of Wolf – Rayet stars beyond the Magellanic Clouds have been studies of late WN stars in M33 by Smith et al. (1995) and Crowther et al. (1997). Bianchi et al. (1996b) have published UV spectroscopy ...
Chapter 12
... seems to move against the background even though in reality it is your head that has changed position, not your hand. This simple demonstration illustrates how parallax gives a clue to an object’s distance. If you hold your hand at different distances from your face, you will notice that the apparen ...
... seems to move against the background even though in reality it is your head that has changed position, not your hand. This simple demonstration illustrates how parallax gives a clue to an object’s distance. If you hold your hand at different distances from your face, you will notice that the apparen ...
Lecture notes 18: Galaxies and galaxy clusters
... Immanuel Kant (1724–1824) and Thomas Wright (1711–1786) were among the first to recocnize the possibility that the Milky Way was indeed a stellar disk where the Sun was but one of many. Kant went on to propose that if the Milky Way were limited then perhaps the diffuse “elliptical nebulae” seen in the ...
... Immanuel Kant (1724–1824) and Thomas Wright (1711–1786) were among the first to recocnize the possibility that the Milky Way was indeed a stellar disk where the Sun was but one of many. Kant went on to propose that if the Milky Way were limited then perhaps the diffuse “elliptical nebulae” seen in the ...
Planetary Nebula
... The intense ultraviolet radiation from the white dwarf heats up the expelled layers of gas, which shine brightly in the infrared. GALEX has picked out the ultraviolet light pouring out of this system, shown throughout the nebula in blue, while Spitzer has snagged the detailed infrared signature of t ...
... The intense ultraviolet radiation from the white dwarf heats up the expelled layers of gas, which shine brightly in the infrared. GALEX has picked out the ultraviolet light pouring out of this system, shown throughout the nebula in blue, while Spitzer has snagged the detailed infrared signature of t ...
Aries (constellation)
Aries is one of the constellations of the zodiac. It is located in the northern celestial hemisphere between Pisces to the west and Taurus to the east. The name Aries is Latin for ram, and its symbol is 20px (Unicode ♈), representing a ram's horns. It is one of the 48 constellations described by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations. It is a mid-sized constellation, ranking 39th overall size, with an area of 441 square degrees (1.1% of the celestial sphere).Although Aries came to represent specifically the ram whose fleece became the Golden Fleece of Ancient Greek mythology, it has represented a ram since late Babylonian times. Before that, the stars of Aries formed a farmhand. Different cultures have incorporated the stars of Aries into different constellations including twin inspectors in China and a porpoise in the Marshall Islands. Aries is a relatively dim constellation, possessing only four bright stars: Hamal (Alpha Arietis, second magnitude), Sheratan (Beta Arietis, third magnitude), Mesarthim (Gamma Arietis, fourth magnitude), and 41 Arietis (also fourth magnitude). The few deep-sky objects within the constellation are quite faint and include several pairs of interacting galaxies. Several meteor showers appear to radiate from Aries, including the Daytime Arietids and the Epsilon Arietids.