Results 41 to 50 of about 199 (140)

Deep Bayesian spectral learning for the discovery of hot subdwarf binaries in LAMOST

Astronomy & Astrophysics
Context. Hot subdwarf binaries provide stringent constraints on envelope stripping and binary mass transfer. However, robust identification of these systems in large spectroscopic surveys is hindered by variable data quality and the subtle signatures of ...
Yang Beining, Bu Yude, Zhang Yuhang, Li Qinqin, Lu Guangcheng, Zhang Jiangchuan, Yi Zhenping, Kong Xiaoming, Liu Meng   +8 more
doaj   +1 more source

COOL SUBDWARF INVESTIGATIONS. II. MULTIPLICITY [PDF]

The Astronomical Journal, 2009
accepted by ...
Jao, Wei-Chun, Mason, Brian D., Hartkopf, William I, Henry, Todd J., Ramos, Stephanie N.   +4 more
openaire   +2 more sources

Detection of hot subdwarf binaries and He-poor hot subdwarf stars using machine learning methods and a large sample of Gaia XP spectra

Astronomy & Astrophysics
Context. Hot subdwarfs (hot sds) are compact evolved stars near the extreme horizontal branch, and they are key to understanding stellar evolution and the UV excess in galaxies.
Ambrosch M., Viscasillas Vázquez C., Solano E., Ulla A., Pérez-Couto X., Pérez-Fernández E., Medžiūnas A., Manteiga M., Dafonte C., Drazdauskas A., Magrini L., Mikolaitis Š., Šatas V.   +12 more
doaj   +1 more source

THE ALLWISE MOTION SURVEY AND THE QUEST FOR COLD SUBDWARFS [PDF]

The Astrophysical Journal, 2014
The AllWISE processing pipeline has measured motions for all objects detected on WISE images taken between 2010 January and 2011 February. In this paper, we discuss new capabilities made to the software pipeline in order to make motion measurements possible, and we characterize the resulting data products for use by future researchers.
Kirkpatrick, J. Davy, Schneider, Adam, Fajardo-Acosta, Sergio, Gelino, Christopher R., Mace, Gregory N., Wright, Edward L., Logsdon, Sarah E., McLean, Ian S., Cushing, Michael C., Skrutskie, Michael F., Eisenhardt, Peter R., Stern, Daniel, Baloković, Mislav, Burgasser, Adam J., Faherty, Jacqueline K., Lansbury, George B., Rich, J. A., Skrzypek, Nathalie, Fowler, John W., Cutri, Roc M., Masci, Frank J., Conrow, Tim, Grillmair, Carl J., McCallon, Howard L., Beichman, Charles A., Marsh, Kenneth A.   +25 more
openaire   +4 more sources

Investigation of the Nature of the B[e] Star CI Cam in the Optical Range

Galaxies
The B[e] phenomenon is observed in a wide range of stars at various evolutionary stages. Its nature remains uncertain. The B[e] phenomenon is defined as the simultaneous presence of low-excitation forbidden line emission and strong infrared excess in the
Elena A. Barsukova, Vitaly P. Goranskij, Aleksandr N. Burenkov, Ilya A. Yakunin   +3 more
doaj   +1 more source

The hot subdwarfs revisited

The Astrophysical Journal, 1982
The properties and evolutionary status of the hot B and O subdwarfs are reinvestigated using recent homogeneous grids of hot, high-gravity model atmospheres and detailed convective envelope calculations appropriate to the hot subdwarf region of the H-R diagram discussed by Greenstein and Sargent.
F. Wesemael, D. E. Winget, W. Cabot, H. M. van Horn, G. Fontaine   +4 more
openaire   +1 more source

The population of hot subdwarf stars studied withGaia [PDF]

Astronomy & Astrophysics, 2017
In preparation for the upcoming all-sky data releases of the Gaia mission we compiled a catalogue of known hot subdwarf stars and candidates drawn from the literature and yet unpublished databases. The catalogue contains 5613 unique sources and provides multi-band photometry from the ultraviolet to the far infrared, ground based proper motions ...
Geier S., Ostensen R. H., Nemeth P., Gentile Fusillo N. P., Gansicke B. T., Telting J. H., Green E. M., Schaffenroth J.   +7 more
openaire   +4 more sources

Pulsations driven by the ɛ-mechanism in post-merger remnants: First results

EPJ Web of Conferences, 2013
Helium-rich subdwarfs are a rare subclass of hot subdwarf stars which constitute a small and inhomogeneous group showing varying degrees of helium enrichment. Only one star, LS IV °14 116 has been found to show multiperiodic luminosity variations.
Zhang X., Córsico A.H., Bertolami M.M. Miller, Althaus L.G., Jeffery C.S.   +4 more
doaj   +1 more source

Shaping the horizontal branch: The role of envelope mass in the evolution of stripped core-helium-burning stars

Astronomy & Astrophysics
The location of a star along the horizontal branch (HB) during core-helium burning is primarily determined by the amount of mass lost by its progenitor.
Arancibia Rojas E., Zorotovic M., Vučković M., Bobrick A., Durán-Reyes A.   +4 more
doaj   +1 more source

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, Németh Peter, Heber Ulrich, Battich Tiara, Bertolami Marcelo M. Miller, Latour Marilyn   +5 more
doaj   +1 more source