MSX, 2MASS, and the LARGE MAGELLANIC CLOUD: A Combined Near- and Mid-Infrared View
The Large Magellanic Cloud (LMC) has been observed by the MidcourseSpace Experiment (MSX) in the mid-infrared and the Two Micron All SkySurvey (2MASS) in the near-infrared. We have performed across-correlation of the 1806 MSX catalog sources and nearly 1.4 million2MASS cataloged point and extended sources and find 1664 matches. Usingthe available color information, we identify a number of stellarpopulations and nebulae, including main-sequence stars, giant stars, redsupergiants, carbon- and oxygen-rich asymptotic giant branch (AGB)stars, planetary nebulae, H II regions, and other dusty objects likelyassociated with early-type stars. A total of 731 of these sources haveno previous identification. We compile a listing of all objects, whichincludes photometry and astrometry. The 8.3 μm MSX sensitivity is thelimiting factor for object detection: only the brighter red objects,specifically the red supergiants, AGB stars, planetary nebulae, and H IIregions, are detected in the LMC. The remaining objects are likely inthe Galactic foreground. The spatial distribution of the infrared LMCsources may contribute to understanding stellar formation and evolutionand the overall galactic evolution. We demonstrate that a combined mid-and near-infrared photometric baseline provides a powerful means ofidentifying new objects in the LMC for future ground-based andspace-based follow-up observations.
|
Supernova 1987A - Photometry of the discovery and pre-discovery plates
An analysis of the discovery and prediscovery plates for SN 1987A ispresented. The second earliest reliable photometric measurements for theSN have found to have a B magnitude of 5.00 (+/- 0.15) on Feb.24.12 UT1987, while for Sanduleak -69 deg 202 was found to have a B magnitude of12.12 (+/- 0.15) on Feb 23.08 UT 1987. These discovery and pre-discoveryplates represent, respectively, the second earliest reliable photometricmeasure for the SN and the last known observation of its precursor. TheB magnitude reported here for SN 1987A is about 0.2 mag fainter thanfound by Shelton and Lapasset (1993) five hours later, indicating thatthe supernova was still rising to 'first maximum light' in the Bbandpass 19 hours after the IMB/Kamiokande-II neutrino detection. Dataobtained subsequent to this observation through to the third dayindicates a nearly constant B magnitude.
|
Positional reference stars in the Magellanic Clouds
The equatorial coordinates are determined of 926 stars (mainly ofgalactic origin) in the direction of the Magellanic Clouds at the meanepoch T = 1978.4 with an overall accuracy characterized by the meanvalues of the O-C coordinates, Sa = 0.35 arcsec and Sd = 0.38 arcsec,calculated from the coordinates of the Perth reference stars. Thesevalues are larger than the accuracy expected for primary standard stars.They allow the new positions to be considered as those of reliablesecondary standard stars. The published positions correspond to anunquestionable improvement of the quality of the coordinates provided inthe current catalogs. This study represents an 'astrometric step' in thestarting of a 'Durchmusterung' of the Magellanic Clouds organized by deBoer (1988, 1989).
|
Secondary standards for H-beta photometry in the Southern Hemisphere (second series).
Not Available
|
UBV (RI)c standard stars in the E- and F-regions and in the Magellanic Clouds - a revised catalogue.
Not Available
|
UBV(RI)c photometry of some standard sequences in the Harvard F regions and in the Magellanic Clouds
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1988MNRAS.231.1047M&db_key=AST
|
Zero-Point Checks of Magellanic Cloud Sequences
Not Available
|
Revised UBV photometry of Magellanic Cloud sequences
The old photometry of UBV secondary standards in the Magellanic Clouds(Cousins 1970) has been revised. New measurements made at Sutherland arepresented and analyzed.
|
Photoelectric (B, V) magnitude sequences in the Magellanic Clouds
Not Available
|
Standard Stars for VRI Photometry with S25 Response Photocathodes
Not Available
|
U, B, V, photometry in and near the Magellanic Clouds
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1962MNRAS.124..359W&db_key=AST
|
Photoelectric Magnitude Sequences for the Magellanic Clouds.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1953ApJ...118..314C&db_key=AST
|
INHABITED SKY
