SIMBAD references

2004AJ....127.1594H - Astron. J., 127, 1594-1601 (2004/March-0)

A photometric study of stars in the MBM 12 association.


Abstract (from CDS):

We have monitored four fields containing nine previously identified members of the MBM 12 association to search for photometric variability and periodicity in these pre-main-sequence stars. Seven of the nine are found to be variable and definite periodicity (of 1.2, 2.6, and 6.2 days) is found for three of them, including the classical T Tauri star LkHα 264. Two other members are possibly periodic, but each requires confirmation. In addition, a ``field'' star that is associated with the X-ray source RX J0255.9+2005 was discovered to be a variable with a period of 4.2 days. Our results indicate that the photometric variability characteristics of the known MBM 12 association members are typical of what is found in roughly few-million-year-old stellar groups such as IC 348, supporting arguments for a similar age. In particular, there is a mix of periodic and nonperiodic variables with typical amplitudes (in Cousins I) of 0.1-0.5 mag, in addition to a small number of larger amplitude variables. The periods, as a group, are somewhat shorter than in IC 348, but when allowance is made for the known dependence of period on mass in pre-main-sequence stars the difference may not be significant. Our data confirm and illustrate the value of photometric monitoring as a tool for identifying likely association members and for studying rotation in extremely young stellar groups.

Abstract Copyright:

Journal keyword(s): ISM: Individual: Alphanumeric: MBM 12 - Stars: Pre-Main-Sequence - Stars: Rotation

Simbad objects: 17

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