Results 41 to 50 of about 1,023 (124)
Chemical fingerprints of He-sdO stars
Open Astronomy, 2018 The chemical composition of helium-rich hot subluminous O stars plays an important role to understand and model their formation history. We present a spectroscopic analysis of four He-sdO stars,CD-31° 4800, [CW83] 0904- 02, LSS 1274 and LS IV +10° 9. The
Schindewolf Markus +5 more
doaj +1 more source
New ultracool subdwarfs identified in large-scale surveys using Virtual Observatory tools
, 2012 Aims. The aim of the project is to improve our knowledge of the low-mass and low-metallicity population to investigate the influence of metallicity on the stellar (and substellar) mass function. Methods.
M. R. Zapatero Osorio +5 more
core +1 more source
Hot subdwarfs from the stable Roche lobe overflow channel
, 2009 Context. Hot subdwarfs are core-helium-burning stars with extremely thin envelopes. We discuss the formation and evolution of hot subdwarfs formed through the stable Roche lobe overflow (RLOF) channel of intermediate-mass binaries, although their ...
S. Yu, L. Li
core +1 more source
Open Astronomy, 2017 Evolved stars with a helium core can be formed by non-conservative mass exchange interaction with a companion or by strong mass loss. Their masses are smaller than 0.5 M⊙. In the database of the Sloan Digital Sky Survey (SDSS), there are several thousand
Pelisoli Ingrid +2 more
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Nearby M subdwarfs from LAMOST data release 2
, 2016 International audienceWe identify 108 M subdwarfs (sdMs) out of more than two hundred thousand M type spectra from the second data release (DR2) of the LAMOST regular survey. This sample, among which 58 members are identified for the first time, includes
Du, Bing +24 more
core +1 more source
An additional pulsating mode (7.35 mHz) and pulsations timing variations of PG 1613+426
Open Astronomy, 2017 We present the detection of an additional pulsation mode (7.35 mHz) of a subdwarf B star, PG 1613+426, and periodic Observed minus Calculated (O-C) variations for two existing pulsations. PG 1613+426 is near the hot end of the sdB instability strip.
Otani Tomomi +5 more
doaj +1 more source
The Arizona-Montréal Spectroscopic Survey of hot subluminous stars★
Astronomy & AstrophysicsContext. Hot subdwarf B (sdB) and O (sdO) type stars are evolved helium-burning objects that lost their hydrogen envelope before the helium flash when their progenitors were close to the tip of the red giant branch (RGB).
Latour M. +8 more
doaj +1 more source
Constraining Roche-Lobe Overflow Models Using the Hot-Subdwarf Wide Binary Population
Open Astronomy, 2017 One of the important issues regarding the final evolution of stars is the impact of binarity. A rich zoo of peculiar, evolved objects are born from the interaction between the loosely bound envelope of a giant, and the gravitational pull of a companion ...
Vos Joris, Vučković Maja
doaj +1 more source
Spectroscopic follow-up of hot subdwarf variables found in ZTF
Astronomy & AstrophysicsContext. Hot subdwarf variables (sdBVs) that display large-amplitude (> 1%) short-period variability as a result of radial-mode pulsations have recently become objects of interest, as they show unique properties among the sdBV classes.
Bradshaw Corey W. +4 more
doaj +1 more source
New Pulse Timing Measurements of the sdBV Star CS 1246
Open Astronomy, 2017 CS 1246 is a hot subdwarf B star discovered in 2009 to exhibit a single, large-amplitude radial pulsation. An O-C diagram constructed from this mode revealed reflex motion due to the presence of a low-mass M dwarf, as well as a long-term trend consistent
Hutchens Zackary L. +7 more
doaj +1 more source