The rapid outbursting star GM CEP: An exor in Tr 37?

Aurora Sicilia-Aguilar, Bruno Merin, Felix Hormuth, Peter Abraham, Thomas Henning, Maria Kun, Nimesh A. Patel, Attila Juhasz, Wolfgang Brandner, Lee W. Hartmann, Szilard Csizmadia, Attila Moor

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Abstract

We present optical, IR, and millimeter observations of the solar-type star 13-277, also known as GM Cep, in the 4 Myr old cluster Tr 37. GM Cep experiences rapid magnitude variations of more than 2 mag at optical wavelengths. We explore the causes of the variability, which seem to be dominated by strong increases in the accretion, being similar to EXor episodes. The star shows high, variable accretion rates (up to similar to 10(-6) M (circle dot) yr(-1)) and signs of powerful winds, and it is a very fast rotator (V sin i similar to 43 km s(-1)). Its strong mid-IR excesses reveal a very flared disk and/ or a remnant envelope, most likely out of hydrostatic equilibrium. The 1.3 mm fluxes suggest a relatively massive disk (M-D similar to 0.1 M-circle dot). Nevertheless, the millimeter mass is not enough to sustain increased accretion episodes over large timescales, unless the mass is underestimated due to significant grain growth. We finally explore the possibility of GM Cep having a binary companion, which could trigger disk instabilities producing the enhanced accretion episodes.
Original languageEnglish
Pages (from-to)382-399
Number of pages18
JournalAstrophysical Journal
Volume673
Issue number1
DOIs
Publication statusPublished - 20 Jan 2008

Keywords

  • accretion, accretion disks stars : individual (GM Cephei 13-277) stars : pre-main-sequence stars : variables : other T-TAURI STARS MAIN-SEQUENCE STARS HIGH-RESOLUTION SPECTROSCOPY EMISSION-LINE DIAGNOSTICS INTERMEDIATE-MASS STARS FU-ORIONIS OUTBURSTS BINARY GW-ORIONIS RW-AUR-A YOUNG STARS UX ORIONIS

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    Sicilia-Aguilar, A., Merin, B., Hormuth, F., Abraham, P., Henning, T., Kun, M., Patel, N. A., Juhasz, A., Brandner, W., Hartmann, L. W., Csizmadia, S., & Moor, A. (2008). The rapid outbursting star GM CEP: An exor in Tr 37? Astrophysical Journal, 673(1), 382-399. https://doi.org/10.1086/524055