Globular Clusters
... isochrones (transformed into the observational plane) with the observed CMD is the key procedure to obtain information on the evolutionary status of GC stars. The main sequence and the turn-off After a free-fall phase, the gravitational contraction leads the proto-star to increase its central temper ...
... isochrones (transformed into the observational plane) with the observed CMD is the key procedure to obtain information on the evolutionary status of GC stars. The main sequence and the turn-off After a free-fall phase, the gravitational contraction leads the proto-star to increase its central temper ...
Red Dwarf Stars: Ages, Rotation, Magnetic
... tionary age. Two recent independent age determinations for the 40 Eri B are essentially identical, yielding an age of 5.1±0.7 Gyr (Ballouz et al. 2010; Zhao et al. 2011). We used this WD age to calibrate the measured Ca ii HK and coronal X-ray luminosity (LX ) of the K1 V and M4.5 V stars. We have b ...
... tionary age. Two recent independent age determinations for the 40 Eri B are essentially identical, yielding an age of 5.1±0.7 Gyr (Ballouz et al. 2010; Zhao et al. 2011). We used this WD age to calibrate the measured Ca ii HK and coronal X-ray luminosity (LX ) of the K1 V and M4.5 V stars. We have b ...
First young loose association in the northern hemisphere?
... !!Only the star with a strong H# emission (Fig. 2, left panel) displays a near- and far-infrared excess (Fig. 2, right panel), which is typical of class II infrared sources, i.e. T Tauri stars (TTS) still surrounded by an accretion disc. Moreover we can characterize its properties because this stars ...
... !!Only the star with a strong H# emission (Fig. 2, left panel) displays a near- and far-infrared excess (Fig. 2, right panel), which is typical of class II infrared sources, i.e. T Tauri stars (TTS) still surrounded by an accretion disc. Moreover we can characterize its properties because this stars ...
Chapter 19 Stars Galaxies and the Universe
... they are looking back in time. The light we see from stars today was made millions of years ago. Some stars that we see might have already burned out. However, we can still see them because their light is just reaching Earth. ...
... they are looking back in time. The light we see from stars today was made millions of years ago. Some stars that we see might have already burned out. However, we can still see them because their light is just reaching Earth. ...
Stellar Properties
... • a star could be very bright because is was very close to us; not because it was truly bright • two stars in the same constellation might not be close to each other; one could be much farther away ...
... • a star could be very bright because is was very close to us; not because it was truly bright • two stars in the same constellation might not be close to each other; one could be much farther away ...
Curiosities of the Sky
... contains one little star, and its smaller neighbor is lune-shaped -surely a most singular form for such an object. Both are associated with curious dark lanes running through the clustered stars like trails in the woods. Along the borders of these lanes the stars are ranked in parallel rows, and wha ...
... contains one little star, and its smaller neighbor is lune-shaped -surely a most singular form for such an object. Both are associated with curious dark lanes running through the clustered stars like trails in the woods. Along the borders of these lanes the stars are ranked in parallel rows, and wha ...
Document
... Observational Cosmologists: Try to break the record for the highest redshift quasar. This pushes back the earliest time we can observe the universe. → z large (z is redshift) ...
... Observational Cosmologists: Try to break the record for the highest redshift quasar. This pushes back the earliest time we can observe the universe. → z large (z is redshift) ...
AST1100 Lecture Notes
... Most models of star formation tell us that the formation of planets is a common process. We expect most stars to have planets orbiting them. Why then, has only a very few planets (less than ten by fall 2009) around other stars been seen directly? There are two main reasons for this: 1. The planet’s ...
... Most models of star formation tell us that the formation of planets is a common process. We expect most stars to have planets orbiting them. Why then, has only a very few planets (less than ten by fall 2009) around other stars been seen directly? There are two main reasons for this: 1. The planet’s ...
Document
... Observational Cosmologists: Try to break the record for the highest redshift quasar. This pushes back the earliest time we can observe the universe. → z large (z is redshift) ...
... Observational Cosmologists: Try to break the record for the highest redshift quasar. This pushes back the earliest time we can observe the universe. → z large (z is redshift) ...
PDF format
... the masses of the stars and the sizes of their orbits. Why is this so valuable to know? a) We can predict how long an orbit will take. b) This is the main way we determine the masses of stars. c) This lets us know if two stars that look close together in the sky really orbit one another. ...
... the masses of the stars and the sizes of their orbits. Why is this so valuable to know? a) We can predict how long an orbit will take. b) This is the main way we determine the masses of stars. c) This lets us know if two stars that look close together in the sky really orbit one another. ...
*Studying Complex Star-Forming Fields: Rosette Nebula and Monoceros Loop by Chris Hathaway and Anthony Kuchera
... located near one end of a giant molecular cloud (Rosette Molecular Cloud)—a place of ongoing star formation. The Monoceros Loop (a circular optical nebulosity /in the vicinity of the Rosette Nebula) is thought to be a supernova remnant (the final product of the evolution of a very massive star). Ros ...
... located near one end of a giant molecular cloud (Rosette Molecular Cloud)—a place of ongoing star formation. The Monoceros Loop (a circular optical nebulosity /in the vicinity of the Rosette Nebula) is thought to be a supernova remnant (the final product of the evolution of a very massive star). Ros ...
Stellar Evolution
... Sequence when there is no more hydrogen fuel in their cores The first few events are similar to those in lowermass stars First a hydrogen shell, Then a core burning helium to carbon, Surrounded by helium- and hydrogen-burning shells ...
... Sequence when there is no more hydrogen fuel in their cores The first few events are similar to those in lowermass stars First a hydrogen shell, Then a core burning helium to carbon, Surrounded by helium- and hydrogen-burning shells ...
129 DYNAMICAL STREAMS IN THE SOLAR NEIGHBOURHOOD B
... the structure of the local distribution function could well be due to a lumpy potential related to the presence of strong transient spiral waves. Besides those simulations, a recent model of gas flows in the Galaxy (Bissantz et al. 2003) indicates that the amplitude of the spiral structure in the ma ...
... the structure of the local distribution function could well be due to a lumpy potential related to the presence of strong transient spiral waves. Besides those simulations, a recent model of gas flows in the Galaxy (Bissantz et al. 2003) indicates that the amplitude of the spiral structure in the ma ...
Ch 20 Stellar Evolution
... Could there have been an intervening dust cloud? (Then where is it?) Could its companion have been a red giant? (It became a white dwarf very quickly, then!) © 2011 Pearson Education, Inc. ...
... Could there have been an intervening dust cloud? (Then where is it?) Could its companion have been a red giant? (It became a white dwarf very quickly, then!) © 2011 Pearson Education, Inc. ...
2-star-life-cycle-and-star-classification
... the same luminosity as the star Aldebaran approximately the same temperature as the Rigel. Algol is best classified as a A) main sequence star B) red giant star C) white dwarf star D) red dwarf star 60. Two stars of the same color are plotted on an H-R diagram. Star A is more luminous than star B. W ...
... the same luminosity as the star Aldebaran approximately the same temperature as the Rigel. Algol is best classified as a A) main sequence star B) red giant star C) white dwarf star D) red dwarf star 60. Two stars of the same color are plotted on an H-R diagram. Star A is more luminous than star B. W ...
Using photometric analysis to determine characteristics of the V
... explosion that created a drastic increase in the brightness of the nova. The increase in optical brightness is due to the fact that the in‐falling matter from the companion star cause the white dwarf to approach a mass of 1.4 times that of the Sun (a mass called the Chandrasekhar limit after th ...
... explosion that created a drastic increase in the brightness of the nova. The increase in optical brightness is due to the fact that the in‐falling matter from the companion star cause the white dwarf to approach a mass of 1.4 times that of the Sun (a mass called the Chandrasekhar limit after th ...
INTERSTELLAR MedLab
... Emission – a gas cloud that receives energy from a hot star(s), allowing the nebula to give off radiation in emission. Reflection – dust clouds that reflect (scatter) a star’s light to us Dark – high densities of dust and gas that redden or extinct the light from the stars located behind the cloud. ...
... Emission – a gas cloud that receives energy from a hot star(s), allowing the nebula to give off radiation in emission. Reflection – dust clouds that reflect (scatter) a star’s light to us Dark – high densities of dust and gas that redden or extinct the light from the stars located behind the cloud. ...
ppt - Institute for Astronomy
... two deeply embedded source radio continuum sources. One of the two sources is extended along the axis of the HH 1 jet, and it shows very large proper motions. Optical/infrared HST images have revealed a third tiny jet flow. Proper motion studies show that it comes from the extended radio source, ind ...
... two deeply embedded source radio continuum sources. One of the two sources is extended along the axis of the HH 1 jet, and it shows very large proper motions. Optical/infrared HST images have revealed a third tiny jet flow. Proper motion studies show that it comes from the extended radio source, ind ...
Boötes
Boötes /boʊˈoʊtiːz/ is a constellation in the northern sky, located between 0° and +60° declination, and 13 and 16 hours of right ascension on the celestial sphere. The name comes from the Greek Βοώτης, Boōtēs, meaning herdsman or plowman (literally, ox-driver; from βοῦς bous “cow”). The ""ö"" in the name is a diaeresis, not an umlaut, meaning that each 'o' is to be pronounced separately.One of the 48 constellations described by the 2nd century astronomer Ptolemy, Boötes is now one of the 88 modern constellations. It contains the fourth brightest star in the night sky, the orange-hued Arcturus. Boötes is home to many other bright stars, including eight above the fourth magnitude and an additional 21 above the fifth magnitude, making a total of 29 stars easily visible to the naked eye.