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Author
dc.contributor.author
Derekas, A 
Author
dc.contributor.author
Németh, P 
Author
dc.contributor.author
Southworth, J 
Author
dc.contributor.author
Borkovits, T 
Author
dc.contributor.author
Sárneczky, K 
Author
dc.contributor.author
Pál, A 
Author
dc.contributor.author
Csák, B 
Author
dc.contributor.author
Garcia-Alvarez, D 
Author
dc.contributor.author
Maxted, PFL 
Author
dc.contributor.author
Kiss, LL 
Availability Date
dc.date.accessioned
2020-08-10T09:48:17Z
Availability Date
dc.date.available
2020-08-10T09:48:17Z
Release
dc.date.issued
2015
uri
dc.identifier.uri
http://hdl.handle.net/10831/48808
Abstract
dc.description.abstract
We report the discovery of a new totally-eclipsing binary (RA=06:40:29.11; Dec=+38:56:52.2; J=2000.0; Rmax=17.2 mag) with an sdO primary and a strongly irradiated red dwarf companion. It has an orbital period of Porb=0.187284394(11) d and an optical eclipse depth in excess of 5 magnitudes. We obtained two low-resolution classification spectra with GTC/OSIRIS and ten medium-resolution spectra with WHT/ISIS to constrain the properties of the binary members. The spectra are dominated by H Balmer and He II absorption lines from the sdO star, and phase-dependent emission lines from the irradiated companion. A combined spectroscopic and light curve analysis implies a hot subdwarf temperature of Teff(spec) = 55 000 +/- 3000K, surface gravity of log g(phot) = 6.2 +/- 0.04 (cgs) and a He abundance of log(nHe/nH) = -2.24 +/- 0.40. The hot sdO star irradiates the red-dwarf companion, heating its substellar point to about 22 500K. Surface parameters for the companion are difficult to constrain from the currently available data: the most remarkable features are the strong H Balmer and C II-III lines in emission. Radial velocity estimates are consistent with the sdO+dM classification. The photometric data do not show any indication of sdO pulsations with amplitudes greater than 7mmag, and Halpha-filter images do not provide evidence of the presence of a planetary nebula associated with the sdO star.
Language
dc.language
Angol
Title
dc.title
A new sdO+dM binary with extreme eclipses and reflection effect
Type
dc.type
folyóiratcikk
Date Change
dc.date.updated
2020-06-02T10:23:12Z
Note
dc.description.note
ELTE Gothard Astrophysical Observatory, Szent Imre herceg út 112, Szombathely, H-9704, Hungary Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of SciencesH-1121, Hungary Dr. Karl Remeis-Observatory and ECAP, Astronomisches Inst., FAU Erlangen-Nuremberg, Bamberg, D-96049, Germany Astrophysics Group, Keele University, Newcastle-under-Lyme, ST5 5BG, United Kingdom Baja Astronomical Observatory of Szeged University, Szegedi ú t, Kt. 766, Baja, H-6500, Hungary Instituto de Astrofísica de Canarias, La Laguna, Tenerife, E-38205, Spain Dpto. de Astrofísica, Universidad de la Laguna, La Laguna, Tenerife, E-38206, Spain Grantecan CALP, Breña Baja, La Palma, E-38712, Spain Sydney Institute for Astronomy, School of Physics, University of Sydney, Australia Cited By :5 Export Date: 7 April 2020
Doi ID
dc.identifier.doi
10.1088/0004-637X/808/2/179
Wos ID
dc.identifier.wos
000371002400075
ID Scopus
dc.identifier.scopus
84942133212
MTMT ID
dc.identifier.mtmt
2925299
Issue Number
dc.identifier.issue
2
abbreviated journal
dc.identifier.jabbrev
ASTROPHYS J
Journal
dc.identifier.jtitle
ASTROPHYSICAL JOURNAL
Volume Number
dc.identifier.volume
808
Release Date
dc.description.issuedate
2015
department of Author
dc.contributor.institution
Konkoly Thege Miklós Csillagászati Intézet
department of Author
dc.contributor.institution
Csillagászati Tanszék
department of Author
dc.contributor.institution
Fizika Doktori Iskola
department of Author
dc.contributor.institution
Kísérleti Fizikai Tanszék
department of Author
dc.contributor.institution
MTA Csillagászati és Földtudományi Kutatóközpont
department of Author
dc.contributor.institution
Szegedi Tudományegyetem Bajai Obszervatóriuma
department of Author
dc.contributor.institution
MTA-ELTE Exobolygó Kutatócsoport
department of Author
dc.contributor.institution
MTMT Központi kezelésű szerzők
department of Author
dc.contributor.institution
Gothard Asztrofizikai Obszervatórium és Multidiszciplináris Kutatóközpont
department of Author
dc.contributor.institution
Lendület Légyszem Kutatócsoport
Author institution
dc.contributor.department
Gothard Asztrofizikai Obszervatórium és Multidiszciplináris Kutatóközpont
Author institution
dc.contributor.department
Szegedi Tudományegyetem Bajai Obszervatóriuma
Author institution
dc.contributor.department
Konkoly Thege Miklós Csillagászati Intézet
Author institution
dc.contributor.department
Lendület Légyszem Kutatócsoport
Author institution
dc.contributor.department
Gothard Asztrofizikai Obszervatórium és Multidiszciplináris Kutatóközpont
Author institution
dc.contributor.department
Konkoly Thege Miklós Csillagászati Intézet
Author institution
dc.contributor.department
Lendület Légyszem Kutatócsoport
Author institution
dc.contributor.department
Gothard Asztrofizikai Obszervatórium és Multidiszciplináris Kutatóközpont
Author institution
dc.contributor.department
Lendület Légyszem Kutatócsoport


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A new sdO+dM binary with extreme eclipses and reflection effect
 

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