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J/AJ/114/198                       The Monoceros R2 Cluster (Carpenter+ 1997)

Properties of the Monoceros R2 Stellar Cluster Carpenter J.M., Meyer M.R., Dougados C., Strom S.E., Hillenbrand L.A. <Astron. J. 114, 198 (1997)> =1997AJ....114..198C
ADC_Keywords: Associations, stellar ; Photometry, infrared Abstract: We present an extensive study of the stellar population of an embedded cluster in the MonR2 molecular cloud based upon a wide field (∼15'x15') J, H, and K band mosaic, deep near-infrared imaging at J, H, K, and nbL' bands of the central cluster region, and spectroscopic observations of 34 stars. By comparing the properties of the MonR2 cluster with other star forming regions, we ultimately hope to learn how the properties and formation of stars of various masses are related to the local physical conditions. The K band star counts indicate that the MonR2 cluster extends over a ∼1.1pcx2.1pc area with a FWHM cluster size of ∼0.38pc. Within this region the cluster contains ∼309 stars brighter than m_K=14.5m and ≳475 stars over all magnitudes with a central stellar volume density of ∼9000 stars pc-3. We have further explored the properties of the cluster by using the spectroscopic and photometric data to construct an extinction-limited sample of 115 stars in the central 0.77pcx0.77pc region of the cluster that is designed to contain all stars with A_V≤11.3m and stellar masses ≥0.1M. As a lower limit, 62% of the stars in this sample contain a near-infrared excess at K and/or L band. The K band excess fraction may be as high as 72% if the accretion characteristics of the stars in the MonR2 cluster are similar to stars in Taurus-Auriga. An initial reconnaissance of the stellar mass function suggests that the ratio of high to low mass stars in the extinction-limited sample is consistent with the value expected for a Miller-Scalo IMF. We do not find compelling evidence for mass segregation in the extinction-limited sample for stellar masses ≲2M, although the most massive star (∼10M) in the cluster appears to be forming near the cluster center. The properties of the MonR2 cluster are similar to other rich young clusters in the solar neighborhood, such as NGC 2024 and the Trapezium. (c) 1997 American Astronomical Society. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 06 07 46.2 -06 23 09 Mon R2 = NGC 2176 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 84 512 SQIID photometry of MonR2 table2.dat 84 390 IRCAM3 photometry of MonR2 tables.tex 115 1003 AASTeX version of the tables
Byte-by-byte Description of file: table1.dat table2.dat
Bytes Format Units Label Explanations
1- 4 I4 --- [CMD97] Identification number 5- 6 I2 h RAh Right ascension (1950) 7 A1 --- --- Always ':' 8- 9 I2 min RAm Right ascension (1950) 10 A1 --- --- Always ':' 11- 15 F5.2 s RAs Right ascension (1950) 17 A1 --- DE- Declination sign 18 I1 deg DEd Declination (1950) 19 A1 --- --- Always ':' 20- 21 I2 arcmin DEm Declination (1950) 22 A1 --- --- Always ':' 23- 26 F4.1 arcsec DEs Declination (1950) 29- 33 F5.2 mag Jmag ? J band magnitude 35- 38 F4.2 mag e_Jmag ? 1-sigma uncertainty in Jmag 41- 45 F5.2 mag Hmag ? H band magnitude 47- 50 F4.2 mag e_Hmag ? 1-sigma uncertainty in Hmag 53- 57 F5.2 mag Kmag ? K band magnitude 59- 62 F4.2 mag e_Kmag ? 1-sigma uncertainty in Kmag 65- 69 F5.2 mag nbL' *? nbL' band magnitude (table2.dat only) 71- 74 F4.2 mag e_nbL' ? 1-sigma uncertainty in nbL' 76- 84 A9 --- Notes *Additional notes (table2.dat only)
Note on nbL': The nbL' filter has a peak response at 3.6µm with a full width at half maximum transmission of 0.065µm. Note on Notes: Cross identifications are from Beckwith et al. (1976ApJ...208..390B) and Howard et al. (1994ApJ...425..707H). An asterisk in this column indicates an additional note as listed below: 104 -- Stellar ? 122 -- Non-stellar at H; stellar and nebular components at K and nbL' 124 -- Extended at H and K; likely unresolved stars 129 -- Extended at H and K 151 -- Near IRS5; stellar at J and H; non-stellar at K and nbL' 156 -- Non-stellar 172 -- Non-stellar 193 -- Stellar at J? 214 -- Foreground star 233 -- Extended at H and K 235 -- Extended at K 252 -- Stellar? 254 -- Non-stellar at J and H; stellar and nebular components at K; stellar at nbL' 291 -- Saturated at K; photometry very uncertain in all bands 301 -- Non-stellar at J; stellar and nebulous at H; stellar at K and nbL' 315 -- Non-stellar 319 -- Detected at K, but photometry unreliable 364 -- Stellar with local nebulosity at H and K 372 -- Stellar with local nebulosity at JHK 374 -- Extended at all four bands; likely unresolved stars
Origin: AAS CD-ROM series, Volume 9, 1997 Lee Brotzman [ADS] 26-Sep-1997
(End) [CDS] 05-Feb-1998
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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