2011A&A...526L...1C -
Astronomy and Astrophysics, volume 526, L1-1 (2011/2-1)
The outburst of an embedded low-mass YSO in L1641.
CARATTI O GARATTI A., GARCIA LOPEZ R., SCHOLZ A., GIANNINI T., EISLOEFFEL J., NISINI B., MASSI F., ANTONIUCCI S. and RAY T.P.
Abstract (from CDS):
Strong outbursts in very young and embedded protostars are rare and not yet fully understood. They are believed to originate from an increase in the mass accretion rate ({dot}(M)
acc) onto the source. We report the discovery of a strong outburst in a low-mass embedded young stellar object (YSO), namely
2MASS-J05424848-0816347 or
[CTF93]216-2, as well as its photometric and spectroscopic follow-up. Using near- to mid-IR photometry and NIR low-resolution spectroscopy, we monitor the outburst, deriving its magnitude, duration, as well as the enhanced accretion luminosity and mass accretion rate.
[CTF93]216-2 increased in brightness by ∼4.6, 4.0, 3.8, and 1.9mag in the J, H, K
s bands and at 24µm, respectively, corresponding to an L
bol increase of ∼20L
☉. Its early spectrum, probably taken soon after the outburst, displays a steep almost featureless continuum, with strong CO band heads and H
2O broad-band absorption features, and Brγ line in emission. A later spectrum reveals more absorption features, allowing us to estimate T
eff∼3200K, M
*∼0.25M
☉, and {dot}(M)
acc∼1.2x10
–6M
☉/yr. This makes it one of the lowest mass YSOs with a strong outburst so far discovered.
Abstract Copyright:
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Journal keyword(s):
accretion, accretion disks - stars: formation - ISM: jets and outflows - infrared: ISM
Simbad objects:
6
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