Results 41 to 50 of about 7,790 (232)

Mode identification in three pulsating hot subdwarfs observed with TESS satellite [PDF]

Monthly notices of the Royal Astronomical Society, 2020
We report on the detection of pulsations of three pulsating subdwarf B stars observed by the Transiting Exoplanet Survey Satellite (TESS) satellite and our results of mode identification in these stars based on an asymptotic period relation.
S. K. Sahoo, A. Baran, U. Heber, J. Ostrowski, S. Sanjayan, R. Silvotti, A. Irrgang, M. Uzundag, M. Reed, K. A. Shoaf, R. Raddi, M. Vučković, H. Ghasemi, W. Zong, K. J. B. A. R. Group, I. O. Physics, P. U. -. Krakow, Poland., Nicolaus Copernicus Astronomical Center of the Polish Acade Sciences, Remeis-Sternwarte, Ecap, A. Institute, University of Erlangen-Nurnberg, Germany, I. Torino, Italy, I. D. Astronomía, F. Ciencias, Univ. de Valparaiso, Chile., E. Observatory, D. Physics, Astronomy, M. Science, Missouri State University, Usa, U. P. D. Catalunya, Spain., Institute for Research in Fundamental Sciences, Iran, D. O. Astronomy, Beijing Normal University, P. China, D. Institute, U. Washington, Nsf Astronomy, A. Fellow   +46 more
semanticscholar   +1 more source

FINDING EXTREME SUBDWARFS [PDF]

The Astronomical Journal, 2008
23 pages, 10 figures.
openaire   +2 more sources

Opacity modelling of heavy-metal hot subdwarfs: photoionization of Sr0, Y+, and Zr2 + [PDF]

, 2020
Heavy-metal hot subdwarfs (sdB and sdO) represent a small group of stars with unusually high concentrations of trans-iron elements in their atmospheres, having abundances ~ 10000 times solar. One example is LS IV-14$^{\circ}$ 116, where a number of heavy-
L. Fern'andez-Menchero, C. Jeffery, C. Ramsbottom, C. Ballance   +3 more
semanticscholar   +1 more source

COOL SUBDWARF INVESTIGATIONS. II. MULTIPLICITY [PDF]

The Astronomical Journal, 2009
accepted by ...
Jao, Wei-Chun, Mason, Brian D., Hartkopf, William I, Henry, Todd J., Ramos, Stephanie N.   +4 more
openaire   +2 more sources

Radii of 88 M Subdwarfs and Updated Radius Relations for Low-metallicity M-dwarf Stars [PDF]

Astronomical Journal, 2018
M subdwarfs are low-metallicity M dwarfs that typically inhabit the halo population of the Galaxy. Metallicity controls the opacity of stellar atmospheres; in metal-poor stars, hydrostatic equilibrium is reached at a smaller radius, leading to smaller ...
Aurora Y. Kesseli, J. Kirkpatrick, S. Fajardo-Acosta, M. Penny, B. Gaudi, M. Veyette, P. Boeshaar, C. Henderson, M. Cushing, S. Calchi-Novati, Y. Shvartzvald, P. Muirhead   +11 more
semanticscholar   +1 more source

Kinematics of nearby subdwarf stars [PDF]

Astronomy & Astrophysics, 2005
We present an analysis of the space motions of 742 subdwarf stars based on the sample of Carney et al. (1994, CLLA). Hipparcos parallaxes, TYC2+HIP proper motions and Tycho2 proper motions were combined with radial velocities and metallicities from CLLA. The kinematical behavior is discussed in particular in relation to their metallicities.
Arifyanto, M. I., Fuchs, B., Jahreiss, H., Wielen, R.   +3 more
openaire   +2 more sources

The Age Of Globular Clusters In Light Of Hipparcos: Resolving the Age Problem? [PDF]

, 1997
We review five independent techniques which are used to set the distance scale to globular clusters, including subdwarf main sequence fitting utilizing the recent Hipparcos parallax catalogue.
Axer M., Brian Chaboyer, Buonanno R., Buonanno R., Cayrel de Strobel G., Chaboyer B., Cudworth K. M., de Boer K. S., de Boer K. S., Feast M. W., Lawrence M. Krauss, Mazzitelli I., Moehler S., Moehler S., Nissen P., P. Demarque, Penny A. J., Peter J. Kernan, Pont F., Reid I. N., Skillen I., Unwin S.   +21 more
core   +2 more sources

Purple dwarfs: New L subdwarfs from UKIDSS and SDSS

EPJ Web of Conferences, 2013
The first L subdwarf was a discovered only ten years ago. Less than ten L subdwarfs been published in the literature to date. Metal-poor ultracool atmospheres has not been well understood.
Marocco F., Day-Jones A.C., Jones H.R.A., Burningham B., Pinfield D.J., Zhang Z.H., Gomes J., Galvez-Ortiz M.C.   +7 more
doaj   +1 more source

In Pursuit of the Least Luminous Galaxies

Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010
The dwarf galaxy companions to the Milky Way are unique cosmological laboratories. With luminosities as low as 10−7LMW, they inhabit the lowest mass dark matter halos known to host stars and are presently the most direct tracers of the distribution, mass spectrum, and clustering scale of dark matter.
Beth Willman, Regina Schulte-Ladbeck
wiley   +1 more source

The distance to NGC 6397 by M-subdwarf main-sequence fitting [PDF]

, 1998
Recent years have seen a substantial improvement both in photometry of low luminosity stars in globular clusters and in modelling the stellar atmospheres of late-type dwarfs.
Gizis, John E., Reid, I. Neill
core   +3 more sources