2015MNRAS.453.1484R

Query : 2015MNRAS.453.1484R

2015MNRAS.453.1484R - Mon. Not. R. Astron. Soc., 453, 1484-1488 (2015/October-3)

Searching for I-band variability in stars in the M/L spectral transition region.

RAMSAY G., HAKALA P. and DOYLE J.G.

Abstract (from CDS):

We report on I-band photometric observations of 21 stars with spectral types between M8 and L4 made using the Isaac Newton Telescope. The total amount of time for observations which had a cadence of <2.3 min was 58.5 h, with additional data with lower cadence. We test for photometric variability using the Kruskal-Wallis H-test and find that four sources (2MASS J10224821+5825453, 2MASS J07464256+2000321, 2MASS J16262034+3925190 and 2MASS J12464678+4027150) were found to be significantly variable at least on one epoch. Three of these sources are reported as photometrically variable for the first time. If we include sources which were deemed marginally variable, the number of variable sources is 6 (29 per cent). No flares were detected from any source. The percentage of sources which we found were variable is similar to previous studies. We summarize the mechanisms which have been put forward to explain the light curves of brown dwarfs.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): techniques: photometric - stars: atmospheres - brown dwarfs - stars: low-mass

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 - 2026 		#notes
1 2MASSW J0015447+351603 BD* 00 15 44.7745521624 +35 16 02.641954548           L1.0V 49 0
2 2MASSW J0135358+120522 BD* 01 35 35.8627575329 +12 05 21.890837649           L1.5V 23 0
3 2MASSI J0228110+253738 BD* 02 28 11.01312 +25 37 38.0136           L0 28 0
4 2MASS J02511490-0352459 BD* 02 51 14.9989090169 -03 52 48.074798290       18.851 16.509 L3 40 0
5 TVLM 832-10443 LM* 02 52 26.3035729848 +00 56 22.586938584           M8V 33 1
6 2MASS J03202839-0446358 BD* 03 20 28.3630482681 -04 46 36.396685568           M8.5+T5 49 0
7 LP 412-31 LM* 03 20 59.7114769400 +18 54 22.770750621   20.5 18.881 16.904 14.484 M8V 130 0
8 LSPM J0339+2457 PM* 03 39 52.8107154672 +24 57 27.327811896   21.1   19.0   M7.7V 22 1
9 2MASS J03521086+0210479 LM* 03 52 10.8620042033 +02 10 48.001032678       19.51 16.46 M8.6V 18 0
10 LSPM J0746+2000 BD* 07 46 42.56207 +20 00 32.1839       17.9 15.034 L0+L1.5 201 1
11 2MASS J07472762+2608406 LM* 07 47 27.6265027704 +26 08 40.628338908           M9.5 4 0
12 2MASS J08175266+1947279 BD* 08 17 52.6446963672 +19 47 27.737071944           L0e 14 0
13 2MASS J10224821+5825453 BD* 10 22 48.2210814019 +58 25 45.392929526           L0.6V 54 0
14 LSPM J1108+6830 BD* 11 08 30.7737005711 +68 30 16.720164401       19.3 16.6 L1e 42 0
15 2MASSW J1246467+402715 BD* 12 46 46.7805320592 +40 27 15.003066816           L4V 29 0
16 2MASSI J1300425+191235 BD* 13 00 42.5082106014 +19 12 34.598653499         15.9 L1.7V 64 0
17 2MASSI J1336406+374323 BD* 13 36 40.5935126424 +37 43 22.948625604           L0.4V 14 0
18 TVLM 513-46 BD* 15 01 08.1864639648 +22 50 02.137869060   21.4 15.09 18.0   M8.5V 189 0
19 2MASS J16262034+3925190 BD* 16 26 20.1332795396 +39 25 19.488610341       19.67 16.68 esdL4 55 0
20 2MASS J18071593+5015316 BD* 18 07 15.9375533592 +50 15 31.636789740           L1 54 0
21 2MASS J19064801+4011089 BD* 19 06 48.0751379413 +40 11 08.590575770           L1 41 0
22 VB 10 PM* 19 16 57.6109547886 +05 09 01.600923413     17.30     M8V 499 1

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