2005ApJ...629..451G


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.17CEST00:42:07

2005ApJ...629..451G - Astrophys. J., 629, 451-460 (2005/August-2)

Hubble Space Telescope STIS observations of the accreting white dwarfs in BW Sculptoris, BC Ursae Majoris, and SW Ursae Majoris.

GANSICKE B.T., SZKODY P., HOWELL S.B. and SION E.M.

Abstract (from CDS):

We have observed the short-period dwarf novae BW Scl, BC UMa, and SW UMa using the Hubble Space Telescope Space Telescope Imaging Spectrograph (STIS). In all three systems, the white dwarf is the dominant source of far-ultraviolet flux, even though in BC UMa and SW UMa an additional continuum component contributes ∼10% and ∼20% of the 1400 Å flux, respectively. Fitting the data with detailed white dwarf model spectra, we determine the effective temperatures to be 14,800±900 K (BW Scl), 15,200±1000 K (BC UMa), and 13,900±900 K (SW UMa). The additional continuum component in BC UMa and SW UMa is equally well described by either a blackbody or a power law, which could be associated with emission from the hot spot or from an optically thin accretion disk (or an optically thin layer on top of a colder optically thick disk), respectively. Modeling the narrow metal lines detected in the STIS spectra results in subsolar abundances of carbon, oxygen, and silicon for all three systems and also suggests substantial suprasolar abundances of aluminum. The narrow absorption line profiles imply low white dwarf rotation rates, vsini≲300 km/s for the three white dwarfs. SW UMa is the only system that shows significant short-term variability in the far-ultraviolet range, which is primarily associated with the observed emission lines.

Abstract Copyright:

Journal keyword(s): Stars: Novae, Cataclysmic Variables - Stars: Individual: Constellation Name: BW Sculptoris - Stars: Individual: Constellation Name: BC Ursae Majoris - Stars: Individual: Constellation Name: SW Ursae Majoris - Stars: White Dwarfs

Simbad objects: 19

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Number of rows : 19

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* LL And CV* 00 41 51.47 +26 37 20.9           ~ 58 0
2 V* WX Cet CV* 01 17 04.17 -17 56 23.0           ~ 163 0
3 V* TY Psc CV* 01 25 39.3571482315 +32 23 08.895318080           ~ 106 0
4 V* TZ Per CV* 02 13 50.9628232047 +58 22 52.309133551     12.00     ~ 89 0
5 PHL 1475 CV* 03 10 32.7658212837 -09 45 06.154763507           DB+ 89 0
6 V* SW UMa CV* 08 36 42.7494852536 +53 28 37.976353343           ~ 292 0
7 V* EG Cnc CV* 08 43 03.9868348725 +27 51 49.696061650   11.9       DAe 162 0
8 V* BC UMa CV* 11 52 15.8339091437 +49 14 41.883635263           ~ 97 0
9 V* AL Com CV* 12 32 25.7949185878 +14 20 42.320230643     16.2     ~ 235 0
10 V* HV Vir CV* 13 21 03.1665682309 +01 53 29.071215583           DA 148 0
11 LAWD 52 WD* 13 38 50.4780798626 +70 17 07.641423392 11.807 12.54 12.60 13.01 12.979 DA2.4 200 0
12 V* EK TrA CV* 15 14 01.47 -65 05 32.1   11.90       ~ 118 0
13 V* GW Lib CV* 15 19 55.3336459070 -25 00 24.613958659   9.0       ~ 183 0
14 V* WZ Sge CV* 20 07 36.5036203067 +17 42 14.733657651   15.30 15.20     DAepv 901 0
15 V* VY Aqr CV* 21 12 09.2516769018 -08 49 36.776018749   8.00       ~ 211 1
16 V* EF Peg CV* 21 15 04.1026724023 +14 03 49.335194049           ~ 72 0
17 V* DI Lac No* 22 35 48.4952966889 +52 42 59.640075678   14.89 14.51 14.48   ~ 116 0
18 V* V455 And CV* 23 34 01.4485468687 +39 21 40.866526351   16.22 16.09 16.14   ~ 119 0
19 V* BW Scl No* 23 53 00.8739237163 -38 51 46.659560093   16.7       D 53 0

    Equat.    Gal    SGal    Ecl

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