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

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

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...345l..55s&link_type=abstract

Astronomy and Astrophysics, v.345, p.L55-L57 (1999)

Astronomy and Astrophysics

Astrophysics

9

Stars: Individual: Apmpm J0237-5928, Stars: Activity, Stars: Late-Type, Stars: Kinematics, Stars: Distances

Scientific paper

A new bright (R=13.4) high proper motion star has been detected within our survey of the Southern sky using APM measurements of UK Schmidt plates (Scholz et al. \cite{scholz99}). This star, APMPM J0237-5928 showing the largest proper motion (mu =0.77 arcsec/yr) among the newly discovered relatively bright (11 < R < 15) 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 T_eff=3100 K and solar metallicity were determined using ``NextGen'' model atmospheres for M dwarfs (Hauschildt, Allard & Baron \cite{hauschildt99}). 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 log {L_X}=27.8 for a late-type M dwarf. The heliocentric space motion was obtained as (U,V,W) = (-39,-28,-27) +/- (8,5,6) km s(-1) .

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