SIMBAD references

2011A&A...525A..47R - Astronomy and Astrophysics, volume 525A, 47-47 (2011/1-1)

U-band study of the accretion properties in the σ Orionis star-forming region.


Abstract (from CDS):

This paper presents the results of an U band survey with FORS1/VLT of a large area in the σ Ori 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. as likely members of the cluster. The sample stars range in mass from ∼0.06 to ∼1.2M; 72 of them show evidence of disks and we measure mass accretion rates {dot}(M)acc between <10–11 and few 10–9M/y, using the colors of the diskless stars as photospheric templates. Our results confirm the dependence of {dot}(M)acc on the mass of the central object, which is stronger for low-mass stars and flattens out for masses larger than ∼0.3M; the spread of {dot}(M)acc 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 {dot}(M)acc and the excess emission in the Spitzer bands, and find that at {dot}(M)acc∼10–10M/y the inner disks change from optically thin to optically thick.

Abstract Copyright:

Journal keyword(s): stars: formation - accretion, accretion disks - open clusters and associations: individual: σ Orionis

VizieR on-line data: <Available at CDS (J/A+A/525/A47): tablec2.dat table23.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 204

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2011A&A...525A..47R and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact