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J/AJ/104/1349           Infrared-luminous giants in M32         (Freedman, 1992)

Infrared-luminous giants in M32: an intermediate-age population? FREEDMAN W.L. <Astron. J. 104, 1349 (1992)> =1992AJ....104.1349F (SIMBAD/NED Reference)
ADC_Keywords: Galaxies, optical; Stars, giant; Photometry, infrared Abstract: A previously unknown population of very luminous, red, asymptotic-giant-branch stars has been identified as a result of near-infrared (JHK) imaging in the dwarf elliptical galaxy M32. Situated above the tip of the normal first red giant branch, these stars are intrinsically brighter than the most luminous normal giants in old Galactic globular clusters by approximately 2 bolometric magnitudes. Moreover, they are a full bolometric magnitude brighter than the brightest giants observed in our own Galactic bulge. Several possible explanations for this population are examined, including old long-period variables, binary mergers, supermetallicity, and intermediate-age stars. It is suggested that the simplest explanation at present, is that M32 had a star formation episode less than about 5 billion years ago. These stars would then be the evolved extended asymptotic giant branch population resulting from that event (similar to those stars observed in the intermediate-age clusters in the Magellanic Clouds). This population may be similar to that in the M31 bulge, recently observed by Rich and Mould. The detection of a young component in M32 is of particular interest because historically, M32 has been a fiducial galaxy for population synthesis techniques. An understanding of M32 remains crucial for our understanding of distant and more luminous elliptical galaxies. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1 37 125 M32 JK photometry
Byte-by-byte Description of file: table1
Bytes Format Units Label Explanations
1- 3 I3 --- Id Star identification number 6- 8 I3 pix Xpos X position 11- 13 I3 pix Ypos Y position 17- 21 F5.2 mag Kmag K magnitude 24- 28 F5.2 mag Jmag []? J magnitude 32- 35 F4.2 mag J-K []? J-K colour
References: Rich R.M., Mould J.R., 1991, AJ, 101, 1286 Historical Notes: Keypunched at CDS
(End) James Marcout, Patricia Bauer [CDS] 23-Feb-1995
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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