Results 41 to 50 of about 805 (173)

A NEW SAMPLE OF COOL SUBDWARFS FROM SDSS: PROPERTIES AND KINEMATICS

, 2014
We present a new sample of M subdwarfs compiled from the seventh data release of the Sloan Digital Sky Survey. With 3517 new subdwarfs, this new sample significantly increases the number of spectroscopically confirmed low-mass subdwarfs.
Antonia S. Savcheva, West, Andrew A., Andrew A. West, John J. Bochanski, Savcheva, Antonio S., Bochanski, John J   +5 more
core   +1 more source

Se-ResNet+SVM Model: An Effective Method of Searching for Hot Subdwarfs from LAMOST

The Astrophysical Journal Supplement Series
This paper presents a robust neural network approach for identifying hot subdwarfs. Our method leveraged the Squeeze-and-Excitation Residual Network to extract abstract features, which were combined with experience features to create hybrid features ...
Zhongding Cheng, Xiaoming Kong, Tianmin Wu, Aina Zhang, Bowen Liu, Yude Bu, Zhenxin Lei, Yatao Zhang, Zhenping Yi, Meng Liu   +9 more
doaj   +1 more source

Rotation in sdB stars as revealed by stellar oscillations

Open Astronomy, 2018
An interesting opportunity offered by the detection of stellar oscillations is the possibility to infer the internal rotation rate of a star through the so-called rotational splittings. Such seismic measurements remained rather scarce for hot B subdwarf (
Charpinet Stephane, Giammichele Noemi, Zong Weikai, Van Grootel Valérie, Brassard Pierre, Fontaine Gilles   +5 more
doaj   +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

A small survey of UV-bright stars around the northern ecliptic pole: seeking new p-mode sdB variables for the TESS mission

Open Astronomy, 2019
Starting in 2019, the TESS mission will monitor the northern ecliptic pole for 1 year. Data will be collected at 30-minute and 2-minute cadences, and only a limited amount of slots will be reserved for targets requiring a 20- second cadence.
Prins Saskia, Telting John, Østensen Roy   +2 more
doaj   +1 more source

A 500 pc volume-limited sample of hot subluminous stars

Astronomy & Astrophysics
We present a quantitative spectroscopic and kinematic analysis of a volume-complete sample of hot subluminous stars within 500 pc of the Sun, assembled using accurate parallax measurements from the Gaia space mission Data Release 3 (DR3).
Dawson H., Dorsch M., Geier S., Munday J., Pritzkuleit M., Heber U., Mattig F., Benitez-Palacios D., Vučković M., Pelisoli I., Deshmukh K., Bhat A., Kufleitner L., Uzundag M., Schaffenroth V., Reindl N., Culpan R., Raddi R., Antunes Amaral L., Istrate A. G., Justham S., Østensen R. H., Telting J. H., Steinmetz T., Rodríguez-Segovia N., Fernandez-Schlosser P., Durán-Reyes A., Arancibia-Rojas E., Latour M., Jones G. T., O’Brien M., Sahu S., Elms A.   +32 more
doaj   +1 more source

Spectral energy distributions and colours of hot subluminous stars

Open Astronomy, 2018
Photometric surveys at optical, ultraviolet, and infrared wavelengths provide ever-growing datasets as major surveys proceed. Colour-colour diagrams are useful tools to identify classes of star and provide large samples.
Heber Ulrich, Irrgang Andreas, Schaffenroth Johannes   +2 more
doaj   +1 more source

COOL SUBDWARF INVESTIGATIONS. I. NEW THOUGHTS ON THE SPECTRAL TYPES OF K AND M SUBDWARFS [PDF]

The Astronomical Journal, 2008
Using new spectra of 88 K and M-type subdwarfs, we consider novel methods for assigning their spectral types and take steps toward developing a comprehensive spectral sequence for subdwarf types K3.0 to M6.0. The types are assigned based on the overall morphology of spectra covering 6000Åto 9000Å.
Jao, Wei-Chun, Henry, Todd J., Beaulieu, Thomas D., Subasavage, John P.   +3 more
openaire   +2 more sources

Discovery of the first outbursting hot subdwarf binary: ZTF J0007+4804

Astronomy & Astrophysics
Context. Hot subdwarf binaries with white dwarf companions with orbital periods of less than two hours are progenitor candidates for massive single white dwarfs as well as a variety of thermonuclear explosions. Aims.
Stringer E., Kupfer T., Deshmukh K., Maccarone T., Jackson I., Kosakowski A., Bradshaw C. W., Brown A., Dorsch M., Picco A., Dhillon V. S., Poshyachinda S., Awiphan S.   +12 more
doaj   +1 more source

A Series of Subdwarf Atmospheres.

The Astrophysical Journal Supplement Series, 1961
A series of model stellar atmospheres, representing stars of low heavy- element content, is tabulated. Characteristics of the continua of the models, including (U,B,V) colors and bolometric corrections, are discussed and compared with observations. (auth)
Thomas L. Swihart, David Fischel
openaire   +1 more source