Results 91 to 100 of about 5,486 (209)

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

An Examination of Recent Transformations to the BV(RI)_C Photometric System from the Perspective of Stellar Models for Old Stars

, 2010
Isochrones for ages > 4 Gyr and metallicities in the range -2.5 < [Fe/H] < +0.3 that take the diffusion of helium and recent advances in stellar physics into account are compared with observations in the Johnson-Cousins BV(RI)_C photometric system for ...
Bahcall, Bergbusch, Bergbusch, Bessell, Bessell, Boesgaard, Bohlin, Brasseur, Cacciari, Calamida, Caldwell, Carretta, Casagrande, Cassisi, Cayrel de Strobel, Christensen-Dalsgaard, Clem, Don A. VandenBerg, Dotter, Dotter, Edvardsson, Gratton, Kaluzny, Koch, Kučinskas, L. Casagrande, Magic, McCall, Meléndez, Meléndez, Michaud, Milone, Paulson, Peter B. Stetson, Pietrinferni, Ramírez, Reid, Rood, Sarajedini, Schlegel, Skrutskie, Stetson, Tautvaišiene, VandenBerg, VandenBerg, VandenBerg, VandenBerg, VandenBerg, VandenBerg, Weiss, Weiss, Yong   +51 more
core   +1 more source

HR6819: a puffed-up stripped star system challenging stable mass transfer theory

Astronomy & Astrophysics
Context. HR6819 is the first system with a puffed-up low-mass stripped star + a classical Be star whose nature has been confirmed by optical interferometry.
Picco A., Marchant P., Sana H., Bodensteiner J., Shenar T., Frost A. J., Deshmukh K., Mombarg J. S. G., Pauli D., Willcox R., Kemp A.   +10 more
doaj   +1 more source

The population of hot subdwarf stars studied with Gaia II. The Gaia DR2 catalogue of hot subluminous stars

, 2018
Based on data from the ESA Gaia Data Release 2 (DR2) and several ground-based, multi-band photometry surveys we compiled an all-sky catalogue of $39\,800$ hot subluminous star candidates selected in Gaia DR2 by means of colour, absolute magnitude and ...
Fusillo, N. P. Gentile, Geier, S., Marsh, T. R., Raddi, R.   +3 more
core   +1 more source

Microscopic diffusion and subdwarfs

, 1999
The recent distance determinations by HIPPARCOS have allowed to locate very precisely a reasonable set of subdwarfs in the HR diagram. A detailed comparison with evolutionary models is now possible and it has been recently claimed that the observed lower part of the main-sequence is cooler than the computed one.
Morel, P., Baglin, A.
openaire   +2 more sources

The massive hot subdwarf binary LAMOST J065816.72+094343.1

Astronomy & Astrophysics
Context. Massive short-period binaries involving hot subdwarf stars (sdO/Bs) are rare but very relevant to constraining pathways for binary star evolution.
Mattig F., Barlow B. N., Liu D., Dorsch M., Geier S., Pritzkuleit M., Dawson H., Wang B., Schaffenroth V., Kupfer T., Derbyshire C., Barocci-Faul S.   +11 more
doaj   +1 more source

A New Class of Roche Lobe–filling Hot Subdwarf Binaries [PDF]

, 2020
Thomas Kupfer, Evan B. Bauer, Kevin B. Burdge, Jan van Roestel, Eric C. Bellm, Jim Fuller, JJ Hermes, Thomas R. Marsh, Lars Bildsten, Shrinivas R. Kulkarni, E. S. Phinney, Thomas A. Prince, Paula Szkody, Yuhan Yao, Andreas Irrgang, Ulrich Heber, David Schneider, Vik S. Dhillon, Gabriel Murawski, Andrew J. Drake, Dmitry A. Duev, Michael Feeney, Matthew J. Graham, Russ R. Laher, S. P. Littlefair, A. A. Mahabal, Frank J. Masci, Michael Porter, Dan Reiley, Hector Rodriguez, Ben Rusholme, David L. Shupe, Maayane T. Soumagnac   +32 more
openalex   +1 more source

BlackGEM observations of compact pulsating stars

Astronomy & Astrophysics
Context. While space-based telescopes offer unparalleled precision for asteroseismology, ground-based observations remain crucial for identifying compact pulsator candidates and enabling their pulsational study through multi-colour photometry.
Ranaivomanana P., Johnston C., Uzundag M., Groot P. J., Kupfer T., Bloemen S., Vreeswijk P. M., van Roestel J. C. J., Pieterse D. L. A., Paice J., Kosakowski A., Ramsay G., Aerts C.   +12 more
doaj   +1 more source

2MASS J06164006-6407194: The First Outer Halo L Subdwarf

, 2009
We present the serendipitous discovery of an L subdwarf, 2MASS J06164006-6407194, in a search of the Two Micron All Sky Survey for T dwarfs. Its spectrum exhibits features indicative of both a cool and metal poor atmosphere including a heavily pressured ...
Burgasser, A. J., Cruz, K., Cushing, M. C., Faherty, J., Kirkpatrick, J. D., Looper, D., Sanderson, R. E., Sweet, A.   +7 more
core   +1 more source

SuperWASP Lightcurves of Subdwarf Stars [PDF]

, 2008
SuperWASP is a wide angle survey for transiting hot-Jupiter exoplanets around bright ...
Maxted, P. F. L., Norton, A. J., West, R. G., Copperwheat, C., Marsh, T. R.   +4 more
openaire   +1 more source