U-band study of the accretion properties in the sigma Ori star-forming region

Details U-band study of the accretion properties in the sigma Ori star-forming region U-band study of the accretion properties in the sigma Ori star-forming region

2010-10-21

arxiv.org/abs/1010.4468v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

19 pages, 17 figures, accepted by A&A

Scientific paper

This paper presents the results of an U band survey with FORS1/VLT of a large area in the sigma Orionis star-forming region. We combine the U-band photometry with literature data to compute accretion luminosity and mass accretion rates from the U-band excess emission for all objects (187) detected by Spitzer in the FORS1 field and classified by Hernandez et al. (2007) as likely members of the cluster. The sample stars range in mass from ~0.06 to ~1.2 Msun; 72 of them show evidence of disks and we measure mass accretion rates Macc between <10^{-11} and few 10^{-9} Msun/yr, using the colors of the diskless stars as photospheric templates. Our results confirm the dependence of Macc on the mass of the central object, which is stronger for low-mass stars and flattens out for masses larger than ~0.3 Msun; the spread of Macc for any value of the stellar mass is ~2 orders of magnitude. We discuss the implications of these results in the context of disk evolution models. Finally, we analyze the relation between Macc and the excess emission in the Spitzer bands, and find that at Macc ~10^{-10} Msun/yr the inner disks change from optically thin to optically thick.

Affiliated with

Also associated with

No associations

Rating

U-band study of the accretion properties in the sigma Ori star-forming region does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with U-band study of the accretion properties in the sigma Ori star-forming region, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and U-band study of the accretion properties in the sigma Ori star-forming region will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-423586