Results 1 to 10 of about 42,939 (197)

A HOT HORIZONTAL BRANCH STAR WITH A CLOSE K-TYPE MAIN-SEQUENCE COMPANION [PDF]

The Astrophysical Journal, 2015
Dynamical interactions in binary systems are thought to play a major role in the formation of extreme horizontal branch stars (EHBs) in the Galactic field. However, it is still unclear if the same mechanisms are at work in globular clusters, where EHBs are predominantly single stars.
C. Moni Bidin, Y. Momany, M. Montalto, M. Catelan, S. Villanova, G. Piotto, D. Geisler   +6 more
openaire   +8 more sources

Evidence of Stellar Oscillations in the Post-common-envelope Binary Candidate ASASSN-V J205543.90+240033.5

The Astrophysical Journal Letters, 2023
ASASSN-V J205543.90+240033.5 (ASJ2055) is a possible post-common-envelope binary system. Its optical photometric data show an orbital variation of about 0.52 days and a fast period modulation of P _0 ∼ 9.77 minutes, whose origin is unknown.
J. Takata, A. K. H. Kong, X. F. Wang, F. F. Song, J. Mao, X. Hou, C.-P. Hu, L. C.-C. Lin, K. L. Li, C. Y. Hui   +9 more
doaj   +1 more source

V2282 Sgr Revisited

Acta Polytechnica CTU Proceedings, 2014
The nature of V2282 Sgr is examined on the basis of several multiband observations: a 20 years long I-band light curve of V2282 Sgr obtained from archive photographic plates of the Asiago and Catania Observatories; a CCD R-band light curve obtained at ...
Roberto Nesci, Corinne Rossi, Antonio Frasca, Ettore Marilli, Paolo Persi, Nicola Cornero   +5 more
doaj   +1 more source

A New Catalog of Am-type Chemically Peculiar Stars Based on LAMOST

The Astrophysical Journal Supplement Series, 2023
A total of about 21,600 Am candidates were detected with the MKCLASS code based on the low-resolution spectra of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope Data Releases 8 (v1.0), 9 (v0), and 10 (v0), which greatly expands the database
Xiao-man Tian, Zhi-hua Wang, Li-ying Zhu, Xiao-Ling Yang   +3 more
doaj   +1 more source

Spectroscopy of hot subdwarf binaries

Open Astronomy, 2018
We present a status report of our spectroscopic analysis of subdwarf binaries consisting of a subdwarf and a F/G/K-type main-sequence companion. These systems selected from SDSS photometry show significant excess in the (infra-)red which can not be ...
Kreuzer Simon, Irrgang Andreas, Heber Ulrich   +2 more
doaj   +1 more source

The Wind Velocities Driven by Alfven Waves in 31 CYG [PDF]

Journal of Astronomy and Space Sciences, 1991
31 Cyg is a ζ Aur-type eclipsing long-period binary composed a K supergiant and a hot main sequence star. Superginats have massive cool winds with low terminal velocities, and it is generally believed that supergiant's winds are driven by Alfven waves ...
Kyung-Mee Kim, Kyu-Hong Choi
doaj  

INVESTIGATION OF COMPONENTS OF THE BINARY SYSTEM 38 PER

Odessa Astronomical Publications, 2017
Radial velocities VT of components of the binary system 38 Per are measured using high resolution and high signal / noise ratio spectra. The orbital elements were updated on the basis of these data and early published measurements of Vr.
L. S. Lyubimkov, T. M. Rachkovskaya, S. I. Rostopchin, A. E. Tarasov   +3 more
doaj   +1 more source

A Pair of Dynamically Interacting Sub-Neptunes around TOI-6054

The Astronomical Journal
We confirm the planetary nature of a pair of transiting sub-Neptune exoplanets orbiting the bright F-type subgiant star TOI-6054 ( V = 8.02, K = 6.673) as a part of the OrCAS radial velocity survey using WIYN/NEID observations. We find that TOI-6054b and
Maxwell A. Kroft, Thomas G. Beatty, Ian J. M. Crossfield, Joseph R. Livesey, Juliette Becker, Jacob K. Luhn, Paul Robertson, Allyson Bieryla, David R. Ciardi, Catherine A. Clark, Maria V. Goliguzova, Steve B. Howell, Jack J. Lissauer, Colin Littlefield, Michael B. Lund, Boris S. Safonov, Joseph M. Akana Murphy, Natalie M. Batalha, Malik Bossett, Jonathan Brande, Tansu Daylan, Courtney Dressing, Anna Gagnebin, Daniel Huber, Howard Isaacson, Stephen R. Kane, Laura Kreidberg, David W. Latham, Rafael Luque, Alex S. Polanski, Pranav H. Premnath, Maleah Rhem, Claire J. Rogers, Emma V. Turtelboom   +33 more
doaj   +1 more source

4FGL J1318.2+6754: A Long Orbital-period Redback Candidate

The Astrophysical Journal Letters
By combining the Fermi catalog and the single-lined spectroscopic binaries of Gaia Data Release 3 (DR3), we report a new candidate redback millisecond pulsar binary, which is recommended as a target for radio telescopes to detect pulsed signals.
Jie Lin, Hailiang Chen, Bojun Wang, Renxin Xu   +3 more
doaj   +1 more source

Using the Coolest Ae Stars to Constrain Circumstellar Disk Viscosity

The Astrophysical Journal
Classical Ae (CAe) stars are main-sequence, A-type stars with H α emission but no signature of dust. They are thought to be the cool extension of the classical Be stars to lower masses.
R. Anusha, T. A. A. Sigut
doaj   +1 more source