Hot subdwarfs in the Galactic Bulge

Abstract

Recent observations and theories suggest that extreme horizontal branch (EHB) stars and their progeny should be the cause of the UV excess seen in the spectra of many elliptical galaxies. Since the Galactic Bulge is the closest representation of an old, metal-rich spheroid in which we are able to study the EHB scenario in detail, we obtained spectra of bulge EHB star candidates and we confirm their status as hot evolved stars. It is the first time that such stars are unambiguously identified in the Galactic Bulge.

10 pages, 3 figures, Astrophysical Journal Letter, accepted

References in corpus (1)

• HST multiband photometry of the globular cluster NGC 6388

Cited by in corpus (16)

• Hot subluminous stars
• The Metal Content of Bulge Field Stars from FLAMES-GIRAFFE Spectra. I. Stellar parameters and Iron Abundances
• Horizontal Branch Stars: The Interplay between Observations and Theory, and Insights into the Formation of the Galaxy
• The Peculiar Horizontal Branch Morphology of the Galactic Globular Clusters NGC 6388 and NGC 6441: new insights from UV observations
• Double white dwarf mergers and elemental surface abundances in extreme helium and R Coronae Borealis stars
• The lack of close binaries among hot horizontal branch stars in NGC6752
• Third generation stellar models for asteroseismology of hot B subdwarf stars. A test of accuracy with the pulsating eclipsing binary PG 1336--018
• First Detection of the White-Dwarf Cooling Sequence of the Galactic Bulge
• AGB Connection and Ultraviolet Luminosity Excess in Elliptical Galaxies
• The Panchromatic Hubble Andromeda Treasury II. Tracing the Inner M31 Halo with Blue Horizontal Branch Stars
• VVV Survey of Blue Horizontal-Branch Stars in the Bulge-Halo Transition Region of the Milky Way
• A Grid of Synthetic Spectra for Subdwarfs: Non-LTE line-blanketed atmosphere models
• Follow-up observations of X-ray emitting hot subdwarf stars: the compact He-poor sdO star Feige 34
• Hidden Figures of Globular Clusters: Integrated Stellar Populations Impacted by Hot Subdwarfs
• Horizontal Branch Stars and the Ultraviolet Universe
• An excess of luminous white dwarfs in the peculiar Galactic globular cluster NGC 2808