Results 51 to 60 of about 805 (173)

The EC14026 Stars — Pulsating Hot Subdwarfs [PDF]

Symposium - International Astronomical Union, 1998
The Edinburgh-Cape Blue Object Survey (Stobie et al. 1997a) is a southern hemisphere survey to discover hot, blue stellar objects brighter than B=18 at galactic latitudes more than 30° from the galactic plane. The main categories of object detected are hot subdwarfs, white dwarfs, blue horizontal branch stars, apparently normal B stars, cataclysmic ...
C. Koen, D. O'Donoghue, D. Kilkenny, R.S. Stobie   +3 more
openaire   +1 more source

Hot subdwarf stars from the Hamburg Quasar Survey

Astronomy & Astrophysics
Hot subluminous stars (subdwarf B&O; sdB, sdO) are evolved low mass stars originating from red giants that lost their envelope almost entirely. The multitude of observed phenomena imply that several pathways may form hot subdwarfs, most involving close ...
Heber U., Kufleitner L., Dorsch M., Latour M., Dawson H., Mattig F., Geier S.   +6 more
doaj   +1 more source

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

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

Mass Distribution for Single-lined Hot Subdwarf Stars in LAMOST

The Astrophysical Journal, 2023
Masses for 664 single-lined hot subdwarf stars identified in LAMOST were calculated by comparing synthetic fluxes from spectral energy distribution with observed fluxes from a Virtual Observatory service.
Zhenxin Lei, Ruijie He, Péter Németh, Xuan Zou, Huaping Xiao, Yong Yang, Jingkun Zhao   +6 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

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

BV CCD Photometry of M71: Distance and Age [PDF]

Journal of Astronomy and Space Sciences, 2004
We present BV CCD photometry of metal-rich globular cluster M71. Based on our color-magnitude diagram (CMD), we derive the distance to M71 using a sample of Hipparcos subdwarfs of similar metallicity. Our distance modulus is (m-M)V=13.46(± 0.17).
Hong-Suh Yim, Mun-Suk Chun, Yong-Ik Byun, Young-Jong Sohn   +3 more
doaj   +1 more source