1999AJ....117.1014H

Query : 1999AJ....117.1014H

1999AJ....117.1014H - Astron. J., 117, 1014-1022 (1999/February-0)

The relationship between ultraviolet line emission and magnetic field strength in magnetic cataclysmic variables.

HOWELL S.B., CASH J., MASON K.O. and HERZOG A.E.

Abstract (from CDS):

We present the first UV spectral observations of six magnetic cataclysmic variables discovered by the ROSAT Wide Field Camera (WFC). Using the International Ultraviolet Explorer (IUE), 1200-3400 Å spectra were obtained of the AM Herculis stars RE 0531-46, RE 1149+28, RE 1844-74, QS Tel (RE 1938-46), and HU Aqr (RE 2107-05) and the DQ Herculis star PQ Gem (RE 0751+14). The high-state UV spectra are dominated by strong emission lines. Continuum flux distributions for these stars (from 100 to 5500 Å) reveal that over this entire range, none of the spectral energy distributions can be fitted by a single-valued blackbody. Our new UV observations and additional archival IUE spectra were used to discover a correlation between the strength of the high-state UV emission lines and the strength of the white dwarf magnetic field. Model spectral results are used to confirm the production of the UV emission lines by photoionization from X-ray and EUV photons.

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Journal keyword(s): Stars: Binaries: Close - Stars: Novae, Cataclysmic Variables - Stars: Individual: Alphanumeric: RE J0531-46 - Stars: Individual: Alphanumeric: RE 1149+28 - Stars: Individual: Alphanumeric: RE J1844-74 - Stars: Individual: Constellation Name: QS Telescopii - Stars: Individual: Constellation Name: HU Aquarii - Stars: Individual: Constellation Name: PQ Geminorum - Stars: Individual: Constellation Name: EF Eridani - Stars: Individual: Constellation Name: BL Hydri - Stars: Individual: Constellation Name: MR Serpentis - Stars: Individual: Constellation Name: V834 Centauri - Stars: Individual: Constellation Name: AM Herculis - Stars: Individual: Constellation Name: VV Puppis - Stars: Magnetic Fields - Ultraviolet Emission

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* BL Hyi CV* 01 41 00.3996430344 -67 53 27.470100660       15.340   DC: 221 0
2 V* EF Eri CV* 03 14 13.2526234800 -22 35 42.900077688   15.4 14.53 13.5   DA 453 0
3 V* UW Pic CV* 05 31 35.6477519256 -46 24 04.962759156           ~ 53 0
4 V* PQ Gem CV* 07 51 17.3280306912 +14 44 23.874868716   14.415 14.162 13.945   ~ 237 0
5 V* VV Pup CV* 08 15 06.8009599464 -19 03 17.765706024     13.90     M7V 413 0
6 V* EU UMa CV* 11 49 55.7017863576 +28 45 07.294697604   15.4       DB+K 83 1
7 V* V834 Cen CV* 14 09 07.2863511816 -45 17 16.023776676       15.301   M6.5 333 0
8 PG 1550+191 CV* 15 52 47.1968971224 +18 56 28.844471472   16.4 15.46 17.0   M6.5Ve 202 0
9 V* AM Her CV* 18 16 13.2546725104 +49 52 04.759613537   15.124 14.808 13.525   M4.5-5Ve 1009 2
10 V* V347 Pav CV* 18 44 48.2632656840 -74 18 34.216501464           ~ 63 0
11 V* QS Tel CV* 19 38 35.8144163880 -46 12 57.106344420           ~ 120 0
12 V* HU Aqr CV* 21 07 58.1944529400 -05 17 40.557671916   16.198 15.814 14.891   D+M4V 292 1

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