Results 101 to 110 of about 4,354 (212)
High-resolution spectroscopic atlas of M subdwarfs. Effective temperature and metallicity [PDF]
, 2014 Context. M subdwarfs are metal poor and cool stars. They are important probes of the old galactic populations. However, they remain elusive due to their low luminosity. Observational and modeling efforts are required to fully understand their physics and
A. Rajpurohit +7 more
semanticscholar +1 more source
Hot subdwarfs: Small stars marking important events in stellar evolution: Ludwig Biermann Award Lecture 2014 [PDF]
, 2015 Hot subdwarfs are considered to be the compact helium cores of red giants which lost almost their entire hydrogen envelope. What causes this enormous mass loss is still unclear.
S. Geier
semanticscholar +1 more source
High-velocity streams in the Milky Way halo with the SDSS and GSC-II kinematic survey
EPJ Web of Conferences, 2012 We explore the stellar halo of the Milky Way to search for fossil signatures of past mergers, consisting of streams of particles torn from their progenitors during the process of hierarchical merging.
Spagna A. +5 more
doaj +1 more source
A NEW SAMPLE OF COOL SUBDWARFS FROM SDSS: PROPERTIES AND KINEMATICS [PDF]
, 2014 We present a new sample of M subdwarfs compiled from the seventh data release of the Sloan Digital Sky Survey. With 3517 new subdwarfs, this new sample significantly increases the number of spectroscopically confirmed low-mass subdwarfs.
A. Savcheva, A. West, J. Bochanski
semanticscholar +1 more source
News on the X-ray emission from hot subdwarf stars
Open Astronomy, 2017 In latest years, the high sensitivity of the instruments on-board the XMM-Newton and Chandra satellites allowed us to explore the properties of the X-ray emission from hot subdwarf stars.
Palombara Nicola La, Mereghetti Sandro
doaj +1 more source
Diffusion in hot subdwarf progenitors from the common envelope channel
Open Astronomy, 2017 Diffusion of elements in the atmosphere of a star can drastically affect its surface composition, sometimes leading to unusual mixtures. These chemically peculiar stars can be identified fromthe presence of unusual lines in their spectra.
Byrne Conor M. +3 more
doaj +1 more source
Analysis of F and G Subdwarfs. III. an Abundance Analysis of the Subdwarf μ Cassiopeia [PDF]
The Astrophysical Journal, 1968 Model atmosphere abundance analysis of subdwarf mu Cassiopeia by measuring spectral line widths and comparing with ...
openaire +2 more sources
Envelope loss of RGB/AGB stars and the formation of hot subdwarfs
EPJ Web of Conferences, 2013 Low mass stars may lose their envelopes in the first giant branch (RGB) or the asymptotic giant branch (AGB) via envelope ejection (i.e. superwind). The envelope loss of AGB stars leads to the formation of carbon-oxygen (CO) white dwarfs (WDs), while the
Chen X., Han Z.
doaj +1 more source
Atomic diffusion in the atmosphere of Feige 86
Open Astronomy, 2017 We have revisited the ultraviolet and optical spectra of the blue horizontal branch star Feige 86. The new analysis finds the star cooler and more compact than previously determined. The IUE spectrum of Feige 86 holds numerous unidentified spectral lines
Németh Péter
doaj +1 more source
A subdwarf’s startling stellar wind [PDF]
Monthly Notices of the Royal Astronomical Society, 1987 Observations selectionnees de la sous naine HD 128220B pour illustrer plusieurs proprietes remarquables de son vent ...
openaire +1 more source