2010A&A...524A..36K


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET03:40:05

2010A&A...524A..36K - Astronomy and Astrophysics, volume 524, A36-36 (2010/12-1)

Constraints on the origin of the massive, hot, and rapidly rotating magnetic white dwarf REJ 0317-853 from an HST parallax measurement.

KUELEBI B., JORDAN S., NELAN E., BASTIAN U. and ALTMANN M.

Abstract (from CDS):

We use the parallax measurements of REJ 0317-853 to determine its mass, radius, and cooling age and thereby constrain its evolutionary origins. We observed REJ 0317-853 with the Hubble Space Telescope's Fine Guidance Sensor to measure the parallax of REJ 0317-853 and its binary companion, the non-magnetic white dwarf LB9802. In addition, we acquired spectra of comparison stars with the Boller & Chivens spectrograph of the SMARTS telescope to correct the parallax zero point. For the corrected parallax, we determine the radius, mass, and the cooling age with the help of evolutionary models from the literature. The properties of REJ 0317-853 are constrained using the parallax information. We discuss the different cases of the core composition and the uncertain effective temperature. We confirm that REJ 0317-853 is close to the Chandrasekhar's mass limit in all cases and almost as old as its companion LB9802. The precise evolutionary history of REJ 0317-853 depends on our knowledge of its effective temperature. It is possible that it had a single star progenitor possible if we assume that the effective temperature is at the cooler end of the possible range from 30000 to 50000K; if Teff is instead at the hotter end, a binary-merger scenario for REJ 0317-853 becomes more plausible.

Abstract Copyright:

Journal keyword(s): white dwarfs - stars: magnetic field - binaries: visual - stars: distances - stars: individual: REJ 0317-853 - supernovae: individual: LB9802

Nomenclature: Fig. 2, Tables 3-5: [KJN2010] RefN (Nos 1-9).

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* CL Oct WD* 03 17 15.8451763319 -85 32 25.561178526   13.78 13.66 15.19   DAP 148 1
2 LB 9802 WD* 03 17 19.1281232921 -85 32 31.288417104   13.78 13.66 14.43   DA 125 1
3 GSC 09495-00756 * 03 18 52.270 -85 35 19.91   13.07 12.41 12.71   F7V 1 0
4 HD 23298 * 03 20 12.9266282881 -85 34 56.160222284   9.86 9.40     F0/2IV/V 4 0
5 GD 50 WD* 03 48 50.1861716368 -00 58 32.290158840 12.596 13.787 14.063 14.210 14.388 DA1.2 239 0
6 PG 1658+441 WD* 16 59 48.4241733860 +44 01 04.041324412   14.3 14.6     DAP1.6 133 0
7 PB 8040 WD* 23 52 31.9204879950 -02 53 11.750081679   17.1 16.99 17.1   DA4.7 30 0

    Equat.    Gal    SGal    Ecl

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2021.03.02-03:40:05

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