Evidence of Resonant Mode Coupling in the Hot B Subdwarf Star KIC 10139564
EPJ Web of Conferences, 2015 The Kepler spacecraft provides new opportinuties to observe long term frequency and amplitude modulations of oscillation modes in pulsating stars. We analyzed more than three years of uninterrupted data obtained with this instrument on the hot B subdwarf
Zong W., Charpinet S., Vauclair G.
doaj +1 more source
The Solar Neighborhood XLII. Parallax Results from the CTIOPI 0.9-m Program --- Identifying New Nearby Subdwarfs Using Tangential Velocities and Locations on the H-R Diagram [PDF]
, 2017 Parallaxes, proper motions, and optical photometry are presented for 51 systems made up 37 cool subdwarf and 14 additional high proper motion systems. Thirty-seven systems have parallaxes reported for the first time, 15 of which have proper motions of at
Henry, Todd +6 more
core +3 more sources
A new HW Vir binary from the Palomar Transient Factory: PTF1 J072455.75+125300.3 - An eclipsing subdwarf B binary with a M-star companion [PDF]
, 2015 We report the discovery of an eclipsing binary -- PTF1 J072456$+$125301-- composed of a subdwarf B (sdB) star ($g'=17.2^m$) with a faint companion. Subdwarf B stars are core helium-burning stars, which can be found on the extreme horizontal branch. About
Drechsel, H. +6 more
core +5 more sources
HST spectroscopy of chemically peculiar hot subdwarfs: PG 0909+276 and UVO0512–08
Open Astronomy, 2017 High-resolution ultraviolet spectroscopy of two chemically peculiar hot subdwarfs, PG 0909+276 and UVO0512-08, has been obtained using the Hubble Space Telescope.
Wild James, Jeffery Christopher Simon
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Multiplicity of the Galactic Senior Citizens: A high-resolution search for cool subdwarf companions [PDF]
, 2014 Cool subdwarfs are the oldest members of the low mass stellar population. Mostly present in the galactic halo, subdwarfs are characterized by their low metallicity.
Baranec, Christoph +4 more
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Binary Hypothesis for the Subdwarf B Stars
The Astrophysical Journal, 1976 While observational evidence exists for the composite nature of some of the subdwarf B stars, the conservation of total mass and angular momentum produces a companion whose visual magnitude is similar to that of the subdwarf in the cases we consider.
John G. Mengel +2 more
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EPJ Web of Conferences, 2013 Precision asteroseismic observations with the Kepler and CoRot satellites enable the internal structure and evolution of pulsating stars to be more exhaustively studied than has hitherto been possible.
Lynas-Gray A.E.
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MUCHFUSS - Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS [PDF]
, 2012 The project Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) aims at finding hot subdwarf stars with massive compact companions (white dwarfs with masses $M>1.0 {\rm M_{\odot}}$, neutron stars or black holes). The existence
Abazajian +26 more
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The masses of hot subdwarfs [PDF]
, 2009 Masses are a fundamental parameter, but they are not well known for most hot subdwarfs. In general, the mass of a hot subdwarf is derived with asteroseismology or dynamical methods, for which it is often difficult to obtain the necessary data from ...
Alexander +40 more
core +1 more source
The OB-type subdwarf HD 149382 and the nature of the subdwarf B stars
The Astrophysical Journal, 1975 High-dispersion spectra and monochromatic continuum measures of the subdwarf OB star HD 149382 have been obtained and analyzed to yield the atmospheric parameters T)=40,000 K, log g=5.8. Helium is deficient by a factor 10 compared to Population I. Sulfur is the only element, other than hydrogen and helium, observed in the blue spectrum of this object ...
B. Baschek, J. Norris
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