2015A&A...584L...9S


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.21CEST18:51:21

2015A&A...584L...9S - Astronomy and Astrophysics, volume 584, L9-9 (2015/12-1)

The nature of the 2014-2015 dim state of RW Aurigae revealed by X-ray, optical, and near-IR observations.

SCHNEIDER P.C., GUENTHER H.M., ROBRADE J., FACCHINI S., HODAPP K.W., MANARA C.F., PERDELWITZ V., SCHMITT J.H.M.M., SKINNER S. and WOLK S.J.

Abstract (from CDS):

The binary system RW Aur consists of two classical T Tauri stars (CTTSs). The primary recently underwent its second observed major dimming event (ΔV∼2mag). We present new, resolved Chandra X-ray and UKIRT near-IR (NIR) data as well as unresolved optical photometry obtained in the dim state to study the gas and dust content of the absorber causing the dimming. The X-ray data show that the absorbing column density increased from NH<0.1x1022cm–2 during the bright state to ≃2x1022cm–2 in the dim state. The brightness ratio between dim and bright state at optical to NIR wavelengths shows only a moderate wavelength dependence and the NIR color-color diagram suggests no substantial reddening. Taken together, this indicates gray absorption by large grains (>1µm) with a dust mass column density of >2x10–4g/cm2. Comparison with NH shows that an absorber responsible for the optical/NIR dimming and the X-ray absorption is compatible with the ISM's gas-to-dust ratio, i.e., that grains grow in the disk surface layers without largely altering the gas-to-dust ratio. Lastly, we discuss a scenario in which a common mechanism can explain the long-lasting dimming in RW Aur and recently in AA Tau.

Abstract Copyright:

Journal keyword(s): stars: individual: RW Aur - stars: pre-main sequence - stars: low-mass - stars: variables: T Tauri, Herbig Ae/Be - X-rays: stars

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 V* AA Tau TT* 04 34 55.4222683130 +24 28 53.038273587 13.14 13.34 12.20     K5Ve 599 0
2 V* RW Aur TT* 05 07 49.538 +30 24 05.07   10.86 9.60 9.95   K1/5e+K5e 694 0
3 GD 71 WD* 05 52 27.6197286025 +15 53 13.228639956 11.675 12.783 13.032 13.169 13.337 DA1.5 323 0

    Equat.    Gal    SGal    Ecl

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2019.10.21-18:51:21

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