2001ApJ...550L..57H

Query : 2001ApJ...550L..57H

2001ApJ...550L..57H - Astrophys. J., 550, L57-L59 (2001/March-3)

Spectroscopic discovery of brown dwarf-like secondary stars in the cataclysmic variables LL Andromedae and EF Eridani.

HOWELL S.B. and CIARDI D.R.

Abstract (from CDS):

Infrared spectroscopic observations of LL Andromedae and EF Eridani are presented. Our K-band spectrum of LL And reveals the presence of methane absorption in the secondary star indicating an effective temperature ≲1300 K, similar to a ``T''-type methane brown dwarf. The secondary star in EF Eri is seen to be warmer with an effective temperature of ∼1650 K and a spectroscopic classification consistent with an L4-5 star. Both secondaries have theoretical mass estimates of 0.04-0.055 M☉ (40-55 MJup). Our IR spectroscopic observations of LL And and EF Eri provide the first direct proof of the theoretical prediction that post-period minimum cataclysmic variables contain brown dwarf-like secondary stars.

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Journal keyword(s): Stars: Binaries: General - Stars: Novae, Cataclysmic Variables - Stars: Individual: Constellation Name: EF Eridani - Stars: Individual: Constellation Name: LL Andromedae - Stars: Low-Mass, Brown Dwarfs

CDS comments: p. L58 : SDSS 1254 = SDSS J125453.90-012247.4, DNS 1228AB = DENIS-P J1228.2-1547

Simbad objects: 8

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Number of rows : 8
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 V* LL And CV* 00 41 51.4929791640 +26 37 21.043803756           ~ 65 0
2 V* EF Eri CV* 03 14 13.2526234800 -22 35 42.900077688   15.4 14.53 13.5   ~ 433 0
3 SIPS J1228-1547 BD* 12 28 15.23184 -15 47 34.2312       20.187 18.163 L5.5+L5.5 145 0
4 V* AL Com CV* 12 32 25.7951754648 +14 20 42.292188276     16.2     ~ 245 0
5 2MASS J12545393-0122474 BD* 12 54 53.9040607346 -01 22 47.399401142           T2e: 150 0
6 GD 165B BD* 14 24 39.09480 +09 17 10.4352         20.53 L4V 205 0
7 V* V592 Her No* 16 30 56.400 +21 16 58.49           ~ 53 0
8 V* WZ Sge CV* 20 07 36.5037622512 +17 42 14.733254952   15.30 15.20     DAepv 947 0

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