2008ApJ...674..421F

Query : 2008ApJ...674..421F

2008ApJ...674..421F - Astrophys. J., 674, 421-430 (2008/February-2)

A near-infrared spectroscopic study of the accreting magnetic white dwarf SDSS J121209.31+013627.7 and its substellar companion.

FARIHI J., BURLEIGH M.R. and HOARD D.W.

Abstract (from CDS):

The nature of the excess near-infrared emission associated with the magnetic white dwarf commonly known as SDSS 1212 is investigated primarily through spectroscopy, and also via photometry. The inferred low-mass secondary in this system has been previously detected by the emission and variation of Hα, and the 1-2.5 µm spectral data presented here are consistent with the presence of a late L or early T dwarf. The excess flux seen beyond 1.5 µm in the phase-averaged spectrum is adequately modeled with an L8 dwarf substellar companion and cyclotron emission in a 7 MG magnetic field. This interesting system manifests several observational properties typical of polars, and is most likely an old interacting binary with a magnetic white dwarf and a substellar donor in an extended low state.

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Journal keyword(s): Stars: Binaries: Close - Infrared: Stars - Stars: Novae, Cataclysmic Variables - Stars: Evolution - Stars: Formation - Stars: Fundamental Parameters - stars: individual (SDSS J121209.31+013627.7) - Stars: Low-Mass, Brown Dwarfs - Stars: White Dwarfs

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 WD 0137-349 WD* 01 39 42.8531929464 -34 42 39.577891392 14.60 15.33 15.30     DA3 90 0
2 NAME WD 0137-349B BD* 01 39 42.9 -34 42 37           L8 32 0
3 V* EF Eri CV* 03 14 13.2526234800 -22 35 42.900077688   15.4 14.53 13.5   ~ 433 0
4 2MASS J12114360+0137020 * 12 11 43.5979706808 +01 37 02.005548096           ~ 1 0
5 UCAC2 32373387 * 12 11 45.8266803144 +01 39 37.386964440           ~ 1 0
6 UCAC2 32373389 * 12 11 47.3595380664 +01 33 59.364376308           ~ 1 0
7 UCAC2 32373390 * 12 11 47.5815548616 +01 37 22.175191848           ~ 1 0
8 2MASS J12115403+0132049 * 12 11 54.0339565056 +01 32 04.776045756           ~ 1 0
9 UCAC2 32373394 * 12 11 55.4089885176 +01 30 39.868443684           ~ 1 0
10 2MASS J12120408+0135365 * 12 12 04.0858741344 +01 35 36.506446656           ~ 2 0
11 2MASS J12120582+0135157 * 12 12 05.8352869824 +01 35 15.732871116           ~ 2 0
12 2MASS J12120662+0138153 * 12 12 06.6398736696 +01 38 15.414463896           ~ 1 0
13 V* V379 Vir CV* 12 12 09.3077194872 +01 36 27.771237504           DAH+dM:e 61 0
14 2MASS J12120989+0135259 * 12 12 09.9011204784 +01 35 26.091996180           ~ 2 0
15 2MASS J12121658+0137042 * 12 12 16.6035502920 +01 37 04.402827120           ~ 2 0
16 UCAC2 32373402 * 12 12 16.6904039064 +01 35 25.843777116           ~ 2 0
17 UCAC2 32373405 * 12 12 22.4046933336 +01 30 10.220406444           ~ 1 0
18 2MASS J12122266+0137425 * 12 12 22.6778898864 +01 37 42.628760292           ~ 1 0
19 UCAC2 32373406 * 12 12 26.4854151960 +01 40 47.710769412           ~ 1 0
20 * 13 Vir * 12 18 40.3174863528 -00 47 13.863547104   6.049 5.897     A5IV/V 48 0
21 FS 132 * 12 21 39.2798147352 -00 07 12.151421076   13.88 13.33     G1 19 0
22 V* AM Her CV* 18 16 13.2546541781 +49 52 04.759861155   15.124 14.808 13.525   M4.5-5Ve 964 0

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