Confirmation of Hostless Type Ia Supernovae Using Hubble Space
... field galaxies (Blanton et al. 2003), but αd may be higher in rich galaxy clusters (e.g., Milne et al. 2007). Adopting αd = −1.5 as an upper limit, the MENeaCS survey estimated that . 2% of the stellar mass in dwarf cluster galaxies below detection thresholds. If the SN Ia occurrence rate per unit m ...
... field galaxies (Blanton et al. 2003), but αd may be higher in rich galaxy clusters (e.g., Milne et al. 2007). Adopting αd = −1.5 as an upper limit, the MENeaCS survey estimated that . 2% of the stellar mass in dwarf cluster galaxies below detection thresholds. If the SN Ia occurrence rate per unit m ...
The redshift of extragalactic nebulae
... It has been known for a long time that there are certain objects in space, which, if observed with small telescopes, appear as strongly blurred, luminous spots. These objects vary in structure. Often they are spheroid, often elliptical, and many of them have a spiral-like appearance, for which reaso ...
... It has been known for a long time that there are certain objects in space, which, if observed with small telescopes, appear as strongly blurred, luminous spots. These objects vary in structure. Often they are spheroid, often elliptical, and many of them have a spiral-like appearance, for which reaso ...
The Alpha Centauri binary system
... found the distance between Proxima and the pair as comparable to the Hill radius of the latter, and favor the existence of a physically bound triple system, suggesting that Proxima is presently at the apoastron of its orbit. The proximity of the α Centauri system provides a well determined parallax, ...
... found the distance between Proxima and the pair as comparable to the Hill radius of the latter, and favor the existence of a physically bound triple system, suggesting that Proxima is presently at the apoastron of its orbit. The proximity of the α Centauri system provides a well determined parallax, ...
Differential rotation in Sun-like stars from surface variability and
... 2014), but as shown by Fig. 1.1 the average rotation rate is much slower than this. To achieve such a wide distribution of rotation periods the spin-up rate of the star must be reduced by some additional mechanisms of AM transport. The timescales at which these mechanisms are important and their exa ...
... 2014), but as shown by Fig. 1.1 the average rotation rate is much slower than this. To achieve such a wide distribution of rotation periods the spin-up rate of the star must be reduced by some additional mechanisms of AM transport. The timescales at which these mechanisms are important and their exa ...
book_text4
... contractors from many countries before Hubble was finally finished. On April 24, 1990, five astronauts aboard the space shuttle Discovery left on a journey that changed our vision of the Universe for ever! They deployed the eagerly anticipated Space Telescope in an orbit roughly 600 km above the Ear ...
... contractors from many countries before Hubble was finally finished. On April 24, 1990, five astronauts aboard the space shuttle Discovery left on a journey that changed our vision of the Universe for ever! They deployed the eagerly anticipated Space Telescope in an orbit roughly 600 km above the Ear ...
IXO as an observatory in the large telescopes era
... 2 Seyfert galaxies. From hard X-ray (>10 keV) all sky surveys with Swift and INTEGRAL, Suzaku has discovered a population of deeply "buried" AGN with very small fractions of scattered lights indicating a geometrically thick torus around the SMBH (Ueda et al. 2007). This implies that many similar obj ...
... 2 Seyfert galaxies. From hard X-ray (>10 keV) all sky surveys with Swift and INTEGRAL, Suzaku has discovered a population of deeply "buried" AGN with very small fractions of scattered lights indicating a geometrically thick torus around the SMBH (Ueda et al. 2007). This implies that many similar obj ...
Here
... of stellar structure, nuclear burning and mixing together for each iteration of each timestep. It details the development of a viscous mesh technique in order to deal with some of the numerical problems that occur during the TP-AGB. Models have been created at solar metallicity (Z = 0.02) and metall ...
... of stellar structure, nuclear burning and mixing together for each iteration of each timestep. It details the development of a viscous mesh technique in order to deal with some of the numerical problems that occur during the TP-AGB. Models have been created at solar metallicity (Z = 0.02) and metall ...
Lokal fulltext - Chalmers Publication Library
... and a semi-major axis of 0.05 AU. The star 51 Pegasi (HR 8729, HD 217014, or Gliese 882) is a G5 V star at a 13.7 pc distance. The proximity between the planet and star is why this planet is also considered to be the first hot Jupiter found. However, it is worth noting that already in 1988 a planet ...
... and a semi-major axis of 0.05 AU. The star 51 Pegasi (HR 8729, HD 217014, or Gliese 882) is a G5 V star at a 13.7 pc distance. The proximity between the planet and star is why this planet is also considered to be the first hot Jupiter found. However, it is worth noting that already in 1988 a planet ...
The evolution of low-metallicity massive stars - Argelander
... Shining bright, they lie there persistently and gloriously, inspiring our fragile human soul since the beginning of time to reach out and explore their mysteries. They have shown the way for us to navigate and discover land and sea, they have made us unravel the secrets of the atom and the nucleus. ...
... Shining bright, they lie there persistently and gloriously, inspiring our fragile human soul since the beginning of time to reach out and explore their mysteries. They have shown the way for us to navigate and discover land and sea, they have made us unravel the secrets of the atom and the nucleus. ...
2 Justification and benefits in joining TMT
... advanced adaptive optics will revolutionise many fields in astronomy. TMT will directly image and probe the atmospheres of extrasolar planets; it will provide key insights into the nature of dark matter and dark energy, and shed light on how galaxies, stars, black holes and planets form and evolve. ...
... advanced adaptive optics will revolutionise many fields in astronomy. TMT will directly image and probe the atmospheres of extrasolar planets; it will provide key insights into the nature of dark matter and dark energy, and shed light on how galaxies, stars, black holes and planets form and evolve. ...
Tracing the Evolution and Impact of the Stellar Winds
... layout is one of the unique flavors of the echelle spectroscopy technique that is necessitated by the peculiarity of its diffraction grating. A diffraction grating diffracts different wavelengths of light in particular directions, and one of its defining characteristics is the spacing between the sl ...
... layout is one of the unique flavors of the echelle spectroscopy technique that is necessitated by the peculiarity of its diffraction grating. A diffraction grating diffracts different wavelengths of light in particular directions, and one of its defining characteristics is the spacing between the sl ...
Paper by Bessell, Castelli and Plez on Model atmospheres
... Another technique is to use maps of the galactic distribution of dust, such as those of Fitzgerald (1986) and Burnstein & Heiles (1982) combined with estimate of the distance of the star from a trigonometric parallax or spectral/luminosity class. However, it is generally believed that within 100 pc ...
... Another technique is to use maps of the galactic distribution of dust, such as those of Fitzgerald (1986) and Burnstein & Heiles (1982) combined with estimate of the distance of the star from a trigonometric parallax or spectral/luminosity class. However, it is generally believed that within 100 pc ...
Altair -- the ``hottest`` magnetically active star in X-rays
... different “physical” periods remains uncertain, yet the derived periods of Altair are close to each other, supporting that rotational modulated X-ray emission is indeed present during the observation. The absence of larger or even moderate flares, which are commonly observed in more active stars, may ...
... different “physical” periods remains uncertain, yet the derived periods of Altair are close to each other, supporting that rotational modulated X-ray emission is indeed present during the observation. The absence of larger or even moderate flares, which are commonly observed in more active stars, may ...
Chapter 19
... • Giants and Supergiants After the main-sequence stage, a star can enter the third stage of its life cycle. A red giant, as it is know known, is a large, reddish star late in its life cycle. • In this third stage, a star can become a red giant. As the center of the star shrinks, the atmosphere of th ...
... • Giants and Supergiants After the main-sequence stage, a star can enter the third stage of its life cycle. A red giant, as it is know known, is a large, reddish star late in its life cycle. • In this third stage, a star can become a red giant. As the center of the star shrinks, the atmosphere of th ...
A spectroscopic study of detached binary systems using precise radial velocities
... this important astrophysical quantity can be estimated in a model-free manner with less than 10% of the orbital cycle observed spectroscopically. Single-lined orbital solutions have been derived for five of the binaries. Two of these systems are astrometric binaries: β Ret and ν Oct. The other SB1 s ...
... this important astrophysical quantity can be estimated in a model-free manner with less than 10% of the orbital cycle observed spectroscopically. Single-lined orbital solutions have been derived for five of the binaries. Two of these systems are astrometric binaries: β Ret and ν Oct. The other SB1 s ...
Science Case for the Chinese Participation of TMT
... advanced adaptive optics will revolutionise many fields in astronomy. TMT will directly image and probe the atmospheres of extrasolar planets; it will provide key insights into the nature of dark matter and dark energy, and shed light on how galaxies, stars, black holes and planets form and evolve. ...
... advanced adaptive optics will revolutionise many fields in astronomy. TMT will directly image and probe the atmospheres of extrasolar planets; it will provide key insights into the nature of dark matter and dark energy, and shed light on how galaxies, stars, black holes and planets form and evolve. ...
ESA BR-170 - ESA Science
... In 1800, the German-born British astronomer and musician, William Herschel – famous for his discovery of the planet Uranus a few years earlier – described that the differently coloured filters through which he observed the Sun allowed different levels of heat to pass. He performed a simple experimen ...
... In 1800, the German-born British astronomer and musician, William Herschel – famous for his discovery of the planet Uranus a few years earlier – described that the differently coloured filters through which he observed the Sun allowed different levels of heat to pass. He performed a simple experimen ...
Astrophysics for Physicists.
... the high school level. Then there are well-known specialized textbooks dealing with important sub-areas of astrophysics (such as stars, galaxies, interstellar matter or cosmology). However, there have been few attempts at bridging the gap between these two kinds of textbooks by writing books coverin ...
... the high school level. Then there are well-known specialized textbooks dealing with important sub-areas of astrophysics (such as stars, galaxies, interstellar matter or cosmology). However, there have been few attempts at bridging the gap between these two kinds of textbooks by writing books coverin ...
Spitzer Spectroscopy of Circumstellar Disks in the 5 Myr Old Upper
... burning limit are surrounded by optically thick disks of gas and dust, the progenitors of planetary systems. Early ground-based infrared (JHKLN −band) observations established that the inner disks (≪ 1.0 AU) around most stars have dispersed by an age of ∼10 Myr (Haisch et al. 2001; Mamajek et al. 20 ...
... burning limit are surrounded by optically thick disks of gas and dust, the progenitors of planetary systems. Early ground-based infrared (JHKLN −band) observations established that the inner disks (≪ 1.0 AU) around most stars have dispersed by an age of ∼10 Myr (Haisch et al. 2001; Mamajek et al. 20 ...
On the characterisation of the Galactic warp in the Gaia era
... all of your support and patience, aspiring guidance and immense knowledge. You always made time to help and advise me. I have been a pleasure for me to work with you. Also, I really appreciate you being so sensitive and supportive towards women’s right. Thank you Luis for being such an incredible te ...
... all of your support and patience, aspiring guidance and immense knowledge. You always made time to help and advise me. I have been a pleasure for me to work with you. Also, I really appreciate you being so sensitive and supportive towards women’s right. Thank you Luis for being such an incredible te ...
Protoplanetary Discs
... ⇒ particle looses J as it moves further in outer particle angular velocity is slightly increased ⇒ particle gains J as it moves further out If there is viscosity, particles at smaller R will drag particles at larger R, trying to increase those particles angular velocity. At the same time, particles ...
... ⇒ particle looses J as it moves further in outer particle angular velocity is slightly increased ⇒ particle gains J as it moves further out If there is viscosity, particles at smaller R will drag particles at larger R, trying to increase those particles angular velocity. At the same time, particles ...
Stellar kinematics
Stellar kinematics is the study of the movement of stars without needing to understand how they acquired their motion. This differs from stellar dynamics, which takes into account gravitational effects. The motion of a star relative to the Sun can provide useful information about the origin and age of a star, as well as the structure and evolution of the surrounding part of the Milky Way.In astronomy, it is widely accepted that most stars are born within molecular clouds known as stellar nurseries. The stars formed within such a cloud compose open clusters containing dozens to thousands of members. These clusters dissociate over time. Stars that separate themselves from the cluster's core are designated as members of the cluster's stellar association. If the remnant later drifts through the Milky Way as a coherent assemblage, then it is termed a moving group.