Erratum: ``The Spectroscopically Determined Substellar Mass Function of the Orion Nebula Cluster'' (ApJ, 610, 1045 [2004])

Details Erratum: ``The Spectroscopically Determined Substellar Mass Function of the Orion Nebula Cluster'' (ApJ, 610, 1045 [2004]) Erratum: ``The Spectroscopically Determined Substellar Mass Function of the Orion Nebula Cluster'' (ApJ, 610, 1045 [2004])

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...625.1063s&link_type=abstract

The Astrophysical Journal, Volume 625, Issue 2, pp. 1063-1063.

Astronomy and Astrophysics

Astronomy

3

Errata, Addenda

Scientific paper

In Table 1 object HC 722 was incorrectly classified as an L0 dwarf. The original classification was based on the apparent prominence in the spectrum of the K I doublet (~7700 Å). However, standard stars available to us at the time were of lower resolution (by a factor of ~2) than the program stars. Narrow spectral features such as the K I doublet were thus blurred and appeared weaker. We have since reanalyzed the spectrum of object HC 722 in comparison to higher resolution standards taken with LRIS (the same instrument used to obtain the spectrum of HC 722), and reclassified it as an M6.5 V dwarf object. In Table 4 the values for HC 722 should be replaced by logTeff=3.429 K, log(L/Lsolar)=-2.89, and M=0.04Msolar.
Note that the object is still considered a dwarf, showing no signs of lower gravity. This, combined with the fact that we derive zero AV for HC 722, implies that it is likely a foreground field dwarf. If we assume an absolute magnitude MK=9.85 mag (S. K. Leggett, ApJS, 82, 351 [1992]) for an M6.5 V star, we derive a distance modulus of 7.58 (d~330 pc). Because HC 722 was previously determined to have higher gravity than members of the ONC, it was not included in the derivation or analysis of the cluster IMF. As this ``high gravity'' assignment is not affected by the reclassification, the change does not alter or impact any of our original conclusions.

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