SIMBAD references

1999A&A...348..800B - Astronomy and Astrophysics, volume 348, 800-804 (1999/8-3)

A search for variability in brown dwarfs and L dwarfs.

BAILER-JONES C.A.L. and MUNDT R.

Abstract (from CDS):

We have undertaken a differential photometric I band search for variability in three Pleiades brown dwarfs and three very low mass field L dwarfs. Analysis of the resultant time series for the Pleiades brown dwarfs (Teide 1, Calar 3, Roque 11) gives no evidence for variability (above 99% confidence) greater than 0.05 mags in any of these objects on timescales between 25 minutes and 27 hours. Time series of two of the L dwarfs, 2MASSW J0913032+184150 and 2MASSW J1146345+223053, are also consistent with no intrinsic variability (no significant variability above 0.07mags for 30mins<τ<126hours, and above 0.025mags for 30mins<τ<75hours, for the two objects respectively). However, the L dwarf 2MASSW J1145572+231730 shows evidence for variability of amplitude 0.04 magnitudes with a tentative period of about 7 hours. It is therefore interesting that Kirkpatrick et al. (1999ApJ...519..802K) report an Hα emission line of 4.2Å equivalent width for this star: If our detection is confirmed as a rotation period, it would support the link between rotation and Hα emission in very low mass stars.

Abstract Copyright:

Journal keyword(s): methods: observational - stars: activity - stars: individual: 2MASSW J1145572+231730 - stars: low-mass, brown dwarfs - stars: rotation

Simbad objects: 9

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2021.07.25-05:17:09

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