SIMBAD references

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.

Abstract Copyright: ∼

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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