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Astron. Astrophys. 345, L55-L57 (1999)

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Letter to the Editor

APMPM J0237-5928: a new nearby active M5 dwarf detected in a high proper motion survey of the Southern sky

R.-D. Scholz 1, M. Irwin 2, A. Schweitzer 3 and R. Ibata 4

1 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany (rdscholz@aip.de)
2 Royal Greenwich Observatory, Madingley Road, Cambridge CB3 OEZ, UK (mike@ast.cam.ac.uk)
3 Landessternwarte, Königstuhl 12, D-69117 Heidelberg, Germany (A.Schweitzer@lsw.uni-heidelberg.de)
4 European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany (ribata@eso.org)

Received 26 March 1999 / Accepted 13 April 1999


A new bright ([FORMULA]) high proper motion star has been detected within our survey of the Southern sky using APM measurements of UK Schmidt plates (Scholz et al. 1999). This star, APMPM J0237-5928 showing the largest proper motion ([FORMULA] arcsec/yr) among the newly discovered relatively bright ([FORMULA]) proper motion stars in 40 UKST fields, was identified with an X-ray source in the ROSAT All Sky Survey, 1RXS J023630.5-592827. The optical spectrum is typical of an M5 dwarf and shows strong emission lines. An effective temperature [FORMULA]=3100 K and solar metallicity were determined using "NextGen" model atmospheres for M dwarfs (Hauschildt, Allard & Baron 1999). A distance between 11 and 14.5 pc is estimated based on the spectral type and on the comparison of the observed spectrum with the models. With this distance we determine the relatively high X-ray luminosity [FORMULA] for a late-type M dwarf. The heliocentric space motion was obtained as [FORMULA] km s-1.

Key words: stars: individual: APMPM J0237-5928 – stars: activity – stars: late-type – stars: kinematics – stars: distances

Send offprint requests to: R.-D. Scholz

© European Southern Observatory (ESO) 1999

Online publication: April 28, 1999