Bibcode
Kun, M.; Ábrahám, P.; Acosta Pulido, J. A.; Moór, A.; Prusti, T.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 483, Issue 4, p.4424-4437
Fecha de publicación:
3
2019
Número de citas
12
Número de citas referidas
11
Descripción
We studied the Class I protostar 2MASS 22352345 + 7517076 whose dramatic
brightening between the IRAS, Akari, and WISE surveys was reported by
Onozato et al. 2MASS 22352345+7517076 is a member of a small group of
low-mass young stellar objects, associated with IRAS 22343 + 7501 in the
molecular cloud Lynds 1251. The IRAS, ISO, Spitzer, Akari, Herschel, and
WISE missions observed different stages of its outburst. Supplemented
these data with archival and our own near-infrared observations, and
considering the contributions of neighbouring sources to the
mid-infrared fluxes we studied the nature and environment of the
outbursting object, and its photometric variations from 1983 to 2017.
The low-state bolometric luminosity Lbol≈32
L⊙ is indicative of a 1.6-1.8 M⊙, 1-2
× 105-yr old protostar. Its 2-μm brightness started
rising between 1993 and 1998, reached a peak in 2009-2011, and started
declining in 2015. Changes in the spectral energy distribution suggest
that the outburst was preceded by a decade-long, slow brightening in the
near-infrared. The actual accretion burst occurred between 2004 and
2007. We fitted the spectral energy distribution in the bright phases
with simple accretion disc models. The modelling suggested an increase
of the disc accretion rate from ˜3.5 × 10-7
M⊙ yr-1 to ˜1.1 × 10-4
M⊙ yr-1. The central star accreted nearly
10-3 M⊙, about a Jupiter mass during the 10 yr
of the outburst. We observed H2 emission lines in the K-band
spectrum during the fading phase in 2017. The associated optical
nebulosity RNO 144 and the Herbig-Haro object HH 149 have not exhibited
significant variation in shape and brightness during the outburst.
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José Antonio
Acosta Pulido