Results 1 to 10 of about 512,763 (150)
A HOT HORIZONTAL BRANCH STAR WITH A CLOSE K-TYPE MAIN-SEQUENCE COMPANION [PDF]
, 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.
C. Moni Bidin +6 more
openalex +5 more sources
Possible Evidence for Metal Accretion onto the Surfaces of Metal-Poor Main-Sequence Stars [PDF]
, 2014 The entire evolution of the Milky Way, including its mass-assembly and star-formation history, is imprinted onto the chemo-dynamical distribution function of its member stars, f(x, v, [X/H]), in the multi-dimensional phase space spanned by position, velocity, and elemental abundance ratios.
Beers, Timothy C. +4 more
arxiv +3 more sources
Revised Stellar Parameters for V471 Tau, A Post-common Envelope Binary in the Hyades [PDF]
, 2021 V471 Tau is a post-common-envelope binary consisting of an eclipsing DA white dwarf and a K-type main-sequence star in the Hyades star cluster. We analyzed publicly available photometry and spectroscopy of V471 Tau to revise the stellar and orbital parameters of the system.
Drout, Maria R. +2 more
arxiv +5 more sources
The Unseen Population of F to K-type Companions to Hot Subdwarf Stars [PDF]
, 2012 We present a method to select hot subdwarf stars with A to M-type companions using photometric selection criteria. We cover a wide range in wavelength by combining GALEX ultraviolet data, optical photometry from the SDSS and the Carlsberg Meridian telescope, near-infrared data from 2MASS and UKIDSS.
Abazajian +98 more
arxiv +3 more sources
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 +9 more
doaj +1 more source
Regular Radial Velocity Variations in Nine G- and K-type Giant Stars: Eight Planets and One Planet Candidate [PDF]
, 2021 We report the detection of radial velocity variations in nine evolved G- and K-type giant stars. The observations were conducted at Okayama Astrophysical Observatory. Planets or planet candidates can best explain these regular variations. However, a coincidence of near 280-day variability among five of them prevents us from fully ruling out stellar ...
arxiv +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 +3 more
doaj +1 more source
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 +5 more
doaj +1 more source
Magnetic Activity of F-, G-, and K-type Stars in the LAMOST-Kepler Field [PDF]
ApJS,247,2020,9, 2020 Monitoring chromospheric and photospheric indexes of magnetic activity can provide valuable information, especially the interaction between different parts of the atmosphere and their response to magnetic fields. We extract chromospheric indexes, S and Rhk+, for 59,816 stars from LAMOST spectra in the LAMOST-Kepler program, and photospheric index, Reff,
arxiv +1 more source
A closer look at the X-ray transient XTE J1908+094: identification of two new near-infrared candidate counterparts [PDF]
, 2005 We had reported in Chaty, Mignani, Israel (2002) on the near-infrared (NIR) identification of a possible counterpart to the black hole candidate XTE J1908+094 obtained with the ESO/NTT.
Casali +14 more
core +4 more sources