Results 71 to 80 of about 3,864 (175)

Stellar Parameters and Orbital Period Estimates for Composite-spectrum Subdwarf + Main-sequence Binaries from LAMOST

The Astrophysical Journal
Hot subdwarf (sdB) stars in binary systems with main-sequence (MS) companions provide valuable insights into mass transfer and envelope ejection processes in binary evolution.
Jiangdan Li, Jianping Xiong, Jiao Li, Hai-Liang Chen, Hongwei Ge, Mingkuan Yang, Xuefei Chen, Zhanwen Han   +7 more
doaj   +1 more source

Nonlinear asteroseismology: insight from amplitude and frequency modulations of oscillation modes in compact pulsators from Kepler photometry

EPJ Web of Conferences, 2017
Nonlinear mode interactions are difficult to observe from ground-based telescopes as the typical periods of the modulations induced by those nonlinear phenomena are on timescales of weeks, months, even years. The launch of space telescopes, e.g., Kepler,
Zong Weikai, Charpinet Stéphane, Vauclair Gérard, Giammichele Noemi, Van Grootel Valérie   +4 more
doaj   +1 more source

The Solar Neighborhood XXVII: Discovery of New Proper Motion Stars with mu > 0.18 "/yr in the Southern Sky with 16.5 > R_59F > 18.0

, 2011
Here we present 1584 new southern proper motion systems with mu > 0.18 "/yr and 16.5 > R_59F > 18.0. This search complements the six previous SuperCOSMOS-RECONS (SCR) proper motion searches of the southern sky for stars within the same proper motion ...
Bakos, Boyd, Burgasser, Finch, Finch, Giclas, Giclas, Hambly, Henry, Henry, Holberg, Jao, Jao, Jao, John P. Subasavage, Luyten, Luyten, Luyten, Lépine, Lépine, Mark R. Boyd, Nigel C. Hambly, Riedel, Subasavage, Subasavage, Subasavage, Todd J. Henry, Wei-Chun Jao   +27 more
core   +1 more source

An additional pulsating mode (7.35 mHz) and pulsations timing variations of PG 1613+426

Open Astronomy, 2017
We present the detection of an additional pulsation mode (7.35 mHz) of a subdwarf B star, PG 1613+426, and periodic Observed minus Calculated (O-C) variations for two existing pulsations. PG 1613+426 is near the hot end of the sdB instability strip.
Otani Tomomi, Oswalt Terry D., Majewski Patrice, Jordan Riley, Amaral Marc, Moss Adam   +5 more
doaj   +1 more source

Habitable Zones and UV Habitable Zones around Host Stars

, 2010
Ultraviolet radiation is a double-edged sword to life. If it is too strong, the terrestrial biological systems will be damaged. And if it is too weak, the synthesis of many biochemical compounds can not go along.
A. Segura, A.P. Buccino, A.P. Buccino, B.W. Jones, B.W. Jones, C. Lindberg, C.A. Iglesias, C.S. Cockell, D. Kilkenny, D. Tepfer, D.M. Williams, F. Forget, F. Hoyle, Fenghui Zhang, I. Lakatos, J.F. Kasting, J.G. Luhmann, J.J. Eldridge, J.P. Guo, J.P. Guo, J.W. Ferguson, Jianpo Guo, K.-P. Schröder, M. Noble, M.A. Mischna, M.H. Hart, M.J. Heath, M.T. Rosing, N. Grevesse, O.R. Pols, O.R. Pols, O.R. Pols, P.P. Eggleton, P.P. Eggleton, P.P. Eggleton, R.B. Setlow, S. Franck, S. Hoerner von, S. Hoerner von, W. Bloh von, X.F. Chen, X.F. Zhang, Xianfei Zhang, Z.W. Han, Z.W. Han, Zhanwen Han   +45 more
core   +1 more source

Are there Two Populations of subdwarf B Stars Visible in Kinematic Samples? [PDF]

Symposium - International Astronomical Union, 1995
The discussions about stellar populations and their spatial distribution can be best advanced by studies of special and well defined star types. The study of subdwarf B stars provides great promise: it is relatively easy both to find sdB stars and to determine their physical parameters.
K. S. De Boer, M. Geffert, M. Odenkirchen, J. H. K. Schmidt, A. Theissen, J. Colin, C. Ducourant, J. F. Lecampion   +7 more
openaire   +1 more source

The Arizona-Montréal Spectroscopic Survey of hot subluminous stars★

Astronomy & Astrophysics
Context. Hot subdwarf B (sdB) and O (sdO) type stars are evolved helium-burning objects that lost their hydrogen envelope before the helium flash when their progenitors were close to the tip of the red giant branch (RGB).
Latour M., Green E. M., Dorsch M., Van Grootel V., Chayer P., Charpinet S., Heber U., Randall S. K., Ma X.-Y.   +8 more
doaj   +1 more source

Discovery of a Second L Subdwarf in the Two Micron All Sky Survey

, 2004
I report the discovery of the second L subdwarf identified in the Two Micron All Sky Survey, 2MASS J16262034+3925190. This high proper motion object (mu = 1.27+/-0.03 "/yr) exhibits near-infrared spectral features indicative of a subsolar metallicity L ...
Adam J. Burgasser, Borysow A., Epchtein N.   +2 more
core   +1 more source

Revised metallicity classes for low-mass stars: dwarfs (dM), subdwarfs (sdM), extreme subdwarfs (esdM), and ultra subdwarfs (usdM)

, 2007
The current classification system of M stars on the main sequence distinguishes three metallicity classes (dwarfs - dM, subdwarfs - sdM, and extreme subdwarfs - esdM).
Bessel M. S., Gizis J. E., Michael M. Shara, R. Michael Rich, Schweitzer A., Sebastien Lepine   +5 more
core   +1 more source

Shell helium-burning hot subdwarf B stars as candidates for blue large-amplitude pulsators [PDF]

, 2022
Heran Xiong, L. Casagrande, X. Chen, J. Vos, Xianfei Zhang, Stephen Justham, Jiao Li, Tao Wu, Yunguo Li, Zhanwen Han   +9 more
openalex   +1 more source