2010A&A...515A..31L -
Astronomy and Astrophysics, volume 515, A31-31 (2010/6-1)
The low-mass diskless population of Corona Australis.
LOPEZ MARTI B., SPEZZI L., MERIN B., MORALES-CALDERON M., BOUY H., BARRADO Y NAVASCUES D. and EISLOEFFEL J.
Abstract (from CDS):
We combine published optical and near-infrared photometry to identify new low-mass candidate members in an area of about 0.64deg2 in Corona Australis with the S-parameter method. Five new candidate members of the region are selected. They have estimated ages between 3 and 15Myr and masses between 0.05 and 0.15M☉. With Spitzer photometry we confirm that these objects are not surrounded by optically thick disks. However, one of them is found to display excess at 24µm, thus suggesting it harbors a disk with an inner hole. With an estimated mass of 0.07M☉ according to the SED fitting, this is one of the lowest-mass objects reported to possess a transitional disk. Including these new members, the fraction of disks is about 50% among the total Corona Australis population selected by the same criteria, lower than the 70% fraction reported earlier for this region. Even so, we find a ratio of transitional to primordial disks (45%) very similar to the value derived by previous authors. This ratio is higher than for solar-type stars (5-10%), suggesting that disk evolution is faster in the latter, and/or that the ``transitional disk'' stage is not such a short-lived step for very low-mass objects. However, this impression needs to be confirmed with better statistics.
Abstract Copyright:
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Journal keyword(s):
stars: low-mass - stars: formation - stars: pre-main sequence - stars: luminosity function, mass function
Nomenclature:
Tables 2, 3, 5: [LSM2010] Cra JHHMMSS.s+DDMMSS.s N=5.
Simbad objects:
27
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