2015MNRAS.446.3878M

Query : 2015MNRAS.446.3878M

2015MNRAS.446.3878M - Mon. Not. R. Astron. Soc., 446, 3878-3884 (2015/February-1)

Low-resolution optical spectra of ultracool dwarfs with OSIRIS/GTC.

METODIEVA Y., ANTONOVA A., GOLEV V., DIMITROV D., GARCIA-ALVAREZ D. and DOYLE J.G.

Abstract (from CDS):

We present the results of low-resolution optical spectroscopy with OSIRIS/GTC (Optical System for Imaging and Low Resolution Integrated Spectroscopy/Gran Telescopio Canarias) for a sample of ultracool dwarfs. For a subsample of seven objects, based on 2 Micron Sky Survey (2MASS) NIR photometric colours, a `photometric' spectral type is determined and compared to the results of the optical spectroscopy. For the stars, showing Hα line in emission, equivalent widths were measured, and the ratio of Hα to bolometric luminosity were calculated. We find that two dwarfs show the presence of magnetic activity over long periods, LP 326-21 - quasi-constant-like, and 2MASS J17071830+6439331 - variable.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): stars: activity - brown dwarfs - stars: chromospheres - stars: low-mass

Simbad objects: 17

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Number of rows : 17
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 LSPM J1354+0846 PM* 13 54 08.7804084720 +08 46 08.423839884   20.4   18.0   M6-8 10 0
2 LP 500-35 PM* 14 28 04.1555758336 +13 56 13.329031046   20.1 17.65 16.2 13.35 M7V 37 0
3 LP 326-21 LM* 14 44 17.1771536455 +30 02 14.229564188   20.0   17.8   M8e 32 0
4 LP 222-65 PM* 15 16 40.7150933568 +39 10 48.398593332   18.1   16.0   M7V 30 0
5 LP 224-38 PM* 16 06 33.7947592274 +40 54 22.040789471   18.8   16.3   M6Ve 32 0
6 2MASS J16241436+0029158 BD* 16 24 14.36712 +00 29 15.8172           T6V 162 0
7 EGGR 258 WD* 16 34 21.5518633862 +57 10 08.868180953       14.770   DQ8 132 0
8 LP 276-22 PM* 16 46 31.5281086884 +34 34 55.180806260   17.7   15.5   M6.0V 35 0
9 LSPM J1707+6439 PM* 17 07 18.3079222344 +64 39 33.182952120   21.7   18.8   M9V 36 0
10 2MASS J17462953+2903386 PM* 17 46 29.5337550216 +29 03 38.644754616           M7.5 4 0
11 2MASS J17465934+4502473 PM* 17 46 59.3449257312 +45 02 47.316278508           M7.5 3 0
12 2MASS J17502484-0016151 BD* 17 50 24.8108937456 -00 16 14.995437500       19.98 17.33 L5.5 53 0
13 2MASS J18573008+5015011 PM* 18 57 30.0706394472 +50 15 01.061735076           M7.5 3 0
14 2MASS J20015863+6427486 PM* 20 01 58.6572198696 +64 27 48.602879964           M7.5 3 0
15 2MASS J21512797+3547206 PM* 21 51 27.9868556976 +35 47 20.785501032           M9.0 5 0
16 2MASS J22594403+8013189 PM* 22 59 44.1115437525 +80 13 19.125569208           M8.5 5 0
17 2MASS J23333174+7456179 PM* 23 33 31.7204201328 +74 56 17.838134628           M8.0 5 0

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