Results 51 to 60 of about 532,841 (292)

A near-infrared study of the star forming region RCW 34

, 2012
We report the results of a near-infrared imaging study of a $7.8 \times 7.8$ arcmin$^2$ region centered on the 6.7 GHz methanol maser associated with the RCW 34 star forming region using the 1.4m IRSF telescope at Sutherland. A total of 1283 objects were
Czanik, R. J., de Villiers, H. M., van der Walt, D. J.   +2 more
core   +1 more source

A probable pre-main sequence chemically peculiar star in the open cluster Stock 16 [PDF]

, 2014
We used the Ultraviolet and Visual Echelle Spectrograph of the ESO-Very Large Telescope to obtain a high resolution and high signal-to-noise ratio spectrum of Stock 16-12, an early-type star which previous Delta-a photometric observations suggest being a
Bagnulo, S., Fossati, L., Netopil, M., Paunzen, E., Pintado, O. I., Zwintz, K.   +5 more
core   +3 more sources

Do Kepler Superflare Stars Really Include Slowly Rotating Sun-like Stars?—Results Using APO 3.5 m Telescope Spectroscopic Observations and Gaia-DR2 Data [PDF]

Astrophysical Journal, 2019
We report the latest view of Kepler solar-type (G-type main-sequence) superflare stars, including recent updates with Apache Point Observatory (APO) 3.5 m telescope spectroscopic observations and Gaia-DR2 data.
Y. Notsu, H. Maehara, S. Honda, S. Hawley, J. Davenport, K. Namekata, S. Notsu, K. Ikuta, D. Nogami, K. Shibata   +9 more
semanticscholar   +1 more source

Evaluating Gyrochronology on the Zero-Age-Main-Sequence: Rotation Periods in the Southern Open Cluster Blanco 1 from the KELT-South Survey [PDF]

, 2013
We report periods for 33 members of Blanco 1 as measured from KELT-South light curves, the first reported rotation periods for this benchmark zero-age-main-sequence open cluster. The distribution of these stars spans from late-A or early-F dwarfs to mid-K with periods ranging from less than a day to ~8 days.
arxiv   +1 more source

Spectral synthesis analysis and radial velocity study of the northern F-, G-, and K-type flare-stars [PDF]

Mon.Not.Roy.Astron.Soc.365:1050,2006, 2005
In this publication we present a study of the general physical, chemical properties and radial velocity monitoring of young active stars. We derive temperatures, log g, [Fe/H], v sin i, and R_{spec} values for eight stars. The detailed analysis reveals that the stars are not as homogeneous in their premier physical parameters as well as in the age ...
arxiv   +1 more source

Unveiling wide-orbit companions to K-type stars in Sco-Cen with Gaia EDR3 [PDF]

, 2021
Abbreviated. We aim to identify new low-mass companions to young stars using the astrometric measurements provided by the Gaia space mission and complementary VLT/SPHERE data. We identify companion candidates from a sample of K-type, pre-main sequence stars in the Scorpius Centaurus association using the early version of the third data release of the ...
arxiv   +1 more source

Chemical evolution of high-mass stars in close binaries. I. The eclipsing binary V453 Cygni

, 2008
The eclipsing and double-lined spectroscopic binary system V453 Cygni consists of two early B-type stars, one of which is nearing the terminal age main sequence and one which is roughly halfway through its main sequence lifetime. Accurate measurements of
Andersen, Andersen, Becker, Becker, Becker, Bessell, Claret, Claret, Cohen, Crawford, Daflon, Daflon, Dufton, Eber, Evans, Freyhammer, Gies, Girardi, Guinan, Hadrava, Heger, Hensberge, Hensberge, Herrero, Herrero, Herrero, Hilditch, Holmgren, Huang, Hunter, Husfeld, Ilijić, J. Southworth, K. Pavlovski, Kilian, Lyubimkov, Lyubimkov, Lyubimkov, Lyubimkov, Maeder, Massey, McErlean, Meynet, Moon, Morel, Morel, Nieva, Pavlovski, Pavlovski, Pavlovski, Pavlovski, Przybilla, Reimann, Ribas, Samland, Schaller, Simkin, Simon, Simon, Southworth, Southworth, Southworth, Southworth, Southworth, Southworth, Sturm, Tonry, Trundle, Venn, Vrancken, Vrancken, Yang, Zucker   +72 more
core   +1 more source

The High Chromospheres of the Late A Stars [PDF]

, 1997
We report the detection of N V 1239 A transition region emission in HST/GHRS spectra of the A7 V stars, Alpha Aql and Alpha Cep. Our observations provide the first direct evidence of 1-3 x 10^5 K material in the atmospheres of normal A-type stars.
Barnes T. G., Schaller G., Simon T., Theodore Simon, Wayne B. Landsman   +4 more
core   +2 more sources

SMC3 as a test to the binary evolution [PDF]

, 2015
SMC 3 is one of the most interesting symbiotic stars. This binary contains a bright K-type giant transferring mass to a massive white dwarf comanion, which makes it is a very promising SN Ia candidate. We discuss the evolutionary status of the system using results of population synthesis code.
arxiv   +1 more source

FAR-UV SPECTROSCOPY OF THE PLANET-HOSTING STAR WASP-13: HIGH-ENERGY IRRADIANCE, DISTANCE, AGE, PLANETARY MASS-LOSS RATE, AND CIRCUMSTELLAR ENVIRONMENT [PDF]

, 2015
Several transiting hot Jupiters orbit relatively inactive main-sequence stars. For some of those, the log R HK ′ ?> activity parameter lies below the basal level (−5.1).
L. Fossati, K. France, T. Koskinen, I. Juvan, C. Haswell, M. Lendl   +5 more
semanticscholar   +1 more source