Results 41 to 50 of about 5,486 (209)

The OB-type subdwarf HD 149382 and the nature of the subdwarf B stars

The Astrophysical Journal, 1975
High-dispersion spectra and monochromatic continuum measures of the subdwarf OB star HD 149382 have been obtained and analyzed to yield the atmospheric parameters T)=40,000 K, log g=5.8. Helium is deficient by a factor 10 compared to Population I. Sulfur is the only element, other than hydrogen and helium, observed in the blue spectrum of this object ...
B. Baschek, J. Norris
openaire   +1 more source

The discovery of a T6.5 subdwarf [PDF]

Monthly Notices of the Royal Astronomical Society, 2014
We report the discovery of ULAS J131610.28+075553.0, a sdT6.5 dwarf in the UKIDSS Large Area Survey 2 epoch proper motion catalogue. This object displays significant spectral peculiarity, with the largest yet seen deviations from T6 and T7 templates in the Y and K bands for this subtype.
B. Burningham, L. Smith, C. V. Cardoso, P. W. Lucas, A. J. Burgasser, H. R. A. Jones, R. L. Smart   +6 more
openaire   +2 more sources

Primeval very low-mass stars and brown dwarfs - III. The halo transitional brown dwarfs [PDF]

, 2018
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.We report the discovery of an
A J Burgasser, Adams, Allard, B Burningham, B López Martí, Bailer-Jones, Baraffe, Baraffe, Baraffe, Basri, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burrows, Burrows, Casali, Cepa, Chabrier, Chambers, Clarke, Cushing, D Homeier, D J Pinfield, Delfosse, Dieterich, Dotter, Dupuy, E L Martín, F Allard, Faherty, Filippazzo, Freudling, H R A Jones, Hambly, Hayashi, Hewett, Hodgkin, Irwin, Jofré, Kilic, Kirkpatrick, Kirkpatrick, Kumar, Laureijs, Lawrence, Line, Lodders, Lodieu, Lodieu, Lodieu, Lodieu, M C Gálvez-Ortiz, M R Zapatero Osorio, Magazzu, Mann, Martín, Massey, N Lodieu, Oke, Pinfield, R L Smart, R Rebolo, Rebolo, Rebolo, Reddy, Ruiz, Shi, Sivarani, Smith, Sutherland, Vernet, Weck, York, Z H Zhang (张曾华), Zhang, Zhang   +78 more
core   +6 more sources

Rotation in sdB stars as revealed by stellar oscillations

Open Astronomy, 2018
An interesting opportunity offered by the detection of stellar oscillations is the possibility to infer the internal rotation rate of a star through the so-called rotational splittings. Such seismic measurements remained rather scarce for hot B subdwarf (
Charpinet Stephane, Giammichele Noemi, Zong Weikai, Van Grootel Valérie, Brassard Pierre, Fontaine Gilles   +5 more
doaj   +1 more source

The Unseen Population of F to K-type Companions to Hot Subdwarf Stars

, 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 ...
Abazajian, Allard, Aungwerojwit, Aznar Cuadrado, Aznar Cuadrado, B. T. Gänsicke, Ballouz, Bertone, Blanchette, Brown, Budavári, C. M. Copperwheat, Carpenter, Castellani, Castelli, Clausen, Copperwheat, D'Cruz, D. Steeghs, de Jong, Dobrzycka, Dorman, Dye, E. Breedt, Edelmann, Fekel, Ferguson, Fitzpatrick, Friedrich, Geier, Geier, Girardi, Girven, Green, Green, Green, Gänsicke, Han, Heber, Heber, Heber, Heber, Heber, Heber, Howarth, Humason, Iben, J. Girven, Jeffery, Jurić, Kilkenny, Koester, Li, Lisker, Marsh, Martin, Maxted, Maxted, Mengel, Michaud, Moni Bidin, Morales-Rueda, Morrissey, Napiwotzki, Napiwotzki, O'Toole, P. Longa-Peña, Papoular, Penning, Pickles, Politano, Rebassa-Mansergas, Reed, Ringwald, Ritter, S. Pyrzas, Saffer, Saffer, Saio, Schlegel, Skrutskie, Stark, Stark, Stroeer, Szkody, Szkody, T. R. Marsh, Thejll, Tillich, Tutukov, U. Heber, Ulla, Vennes, Viton, Wade, Wade, Webbink, Williams, Østensen   +98 more
core   +1 more source

A small survey of UV-bright stars around the northern ecliptic pole: seeking new p-mode sdB variables for the TESS mission

Open Astronomy, 2019
Starting in 2019, the TESS mission will monitor the northern ecliptic pole for 1 year. Data will be collected at 30-minute and 2-minute cadences, and only a limited amount of slots will be reserved for targets requiring a 20- second cadence.
Prins Saskia, Telting John, Østensen Roy   +2 more
doaj   +1 more source

Discoveries from a Near-infrared Proper Motion Survey using Multi-epoch 2MASS Data [PDF]

, 2010
We have conducted a 4030-square-deg near-infrared proper motion survey using multi-epoch data from the Two Micron All-Sky Survey (2MASS). We find 2778 proper motion candidates, 647 of which are not listed in SIMBAD.
Adam J. Burgasser, Anne C. Sweet, Benedict, Borysow, Bowler, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Chiu, Cruz, Cruz, Cushing, Cushing, Cushing, Cushing, Cutri, Dagny L. Looper, Dahn, Emily L. Rice, Faherty, Finch, Geballe, Giclas, Giclas, Gillian R. Knapp, Gizis, Gizis, Hawley, Houck, Ian S. McLean, Innes, Ivezic, J. Davy Kirkpatrick, John J. Bochanski, Kashikawa, Kelle L. Cruz, Kirkpatrick, Kirkpatrick, Kirkpatrick, Kirkpatrick, Knapp, Lodieu, Looper, Looper, Looper, Luhman, Luhman, Luhman, Luyten, Luyten, Luyten, Luyten, Lépine, Lépine, Lépine, Lépine, Lépine, Mark R. McGovern, McLean, Michael C. Cushing, Monet, Radigan, Reid, Reid, Roc M. Cutri, Ruiz, Schmidt, Scholz, Sheppard, Steele, Steven D. Schurr, Teegarden, Thomas L. Roellig, Torres, Travis S. Barman, Vrba, Wolf   +85 more
core   +3 more sources

Se-ResNet+SVM Model: An Effective Method of Searching for Hot Subdwarfs from LAMOST

The Astrophysical Journal Supplement Series
This paper presents a robust neural network approach for identifying hot subdwarfs. Our method leveraged the Squeeze-and-Excitation Residual Network to extract abstract features, which were combined with experience features to create hybrid features ...
Zhongding Cheng, Xiaoming Kong, Tianmin Wu, Aina Zhang, Bowen Liu, Yude Bu, Zhenxin Lei, Yatao Zhang, Zhenping Yi, Meng Liu   +9 more
doaj   +1 more source

Spectral energy distributions and colours of hot subluminous stars

Open Astronomy, 2018
Photometric surveys at optical, ultraviolet, and infrared wavelengths provide ever-growing datasets as major surveys proceed. Colour-colour diagrams are useful tools to identify classes of star and provide large samples.
Heber Ulrich, Irrgang Andreas, Schaffenroth Johannes   +2 more
doaj   +1 more source

A 500 pc volume-limited sample of hot subluminous stars

Astronomy & Astrophysics
We present a quantitative spectroscopic and kinematic analysis of a volume-complete sample of hot subluminous stars within 500 pc of the Sun, assembled using accurate parallax measurements from the Gaia space mission Data Release 3 (DR3).
Dawson H., Dorsch M., Geier S., Munday J., Pritzkuleit M., Heber U., Mattig F., Benitez-Palacios D., Vučković M., Pelisoli I., Deshmukh K., Bhat A., Kufleitner L., Uzundag M., Schaffenroth V., Reindl N., Culpan R., Raddi R., Antunes Amaral L., Istrate A. G., Justham S., Østensen R. H., Telting J. H., Steinmetz T., Rodríguez-Segovia N., Fernandez-Schlosser P., Durán-Reyes A., Arancibia-Rojas E., Latour M., Jones G. T., O’Brien M., Sahu S., Elms A.   +32 more
doaj   +1 more source