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Author
dc.contributor.author
Finlator, K 
Author
dc.contributor.author
Ivezic, Z 
Author
dc.contributor.author
Fan, X H 
Author
dc.contributor.author
Strauss, M A 
Author
dc.contributor.author
Knapp, G R 
Author
dc.contributor.author
Lupton, R H 
Author
dc.contributor.author
Gunn, J E 
Author
dc.contributor.author
Rockosi, C M 
Author
dc.contributor.author
Anderson, J E 
Author
dc.contributor.author
Csabai, I 
Availability Date
dc.date.accessioned
2020-08-08T19:56:34Z
Availability Date
dc.date.available
2020-08-08T19:56:34Z
Release
dc.date.issued
2000
uri
dc.identifier.uri
http://hdl.handle.net/10831/49177
Abstract
dc.description.abstract
We discuss optical and infrared photometric properties of stars matched in the Two Micron All Sky Survey (2MASS) and the Sloan Digital Sky Survey (SDSS) commissioning data for similar to 50 deg(2) of sky along the celestial equator centered at l = 150 degrees, b = -60 degrees. About 98% (similar to 63,000) of objects listed in the 2MASS Point Source Catalog in the analyzed area are matched within 2 " to an SDSS source. The matched sources represent 8% of the similar to 800,000 SDSS sources in this area. They are predominantly red sources, as expected, and 15% of them are resolved in SDSS imaging data although they are detected as point sources in 2MASS data. The distribution of positional discrepancies for the matched sources and the astrometric statistics for the multiply observed SDSS sources imply that the astrometric accuracy of both surveys is about 0."1 per coordinate (rms). For about 14,000 stars with the smallest photometric errors (less than or similar to 10%) in both surveys, we present optical and infrared color-magnitude and color-color diagrams. We use optical (SDSS) colors to identify the stellar spectral sequence and show that stars of different spectral types can have similar infrared colors, thus making the classification of stars based on only 2MASS data very difficult. However, a broad separation into "early" and "late" spectral types (relative to type KO) is possible with a reliability of similar to 95% even with 2MASS colors alone. The distributions of matched sources in color-magnitude and color-color diagrams are compared with the predictions of a stellar population synthesis code. We find that the models are in fair overall agreement with the data. In particular, the total number counts agree to better than 10%, and the morphologies of the color-magnitude and color-color diagrams appear similar. The most significant discrepancies are found for the number ratio of "early" to "late" type stars (by about a factor of 2) and in the colors of M stars (up to 0.2 mag). The first disagreement indicates that some parameters of the standard Galactic structure model and/or initial mass function can be improved, and the second disagreement emphasizes known difficulties with the modeling of stellar atmospheres for cool stars.
Language
dc.language
Angol
Title
dc.title
Optical and infrared colors of stars observed by the Two Micron All Sky Survey and the Sloan Digital Sky Survey
Type
dc.type
folyóiratcikk
Date Change
dc.date.updated
2020-06-05T10:19:25Z
Scope
dc.format.page
2615-2626
Doi ID
dc.identifier.doi
10.1086/316824
Wos ID
dc.identifier.wos
000165095200030
ID Scopus
dc.identifier.scopus
17544393966
MTMT ID
dc.identifier.mtmt
1064413
Issue Number
dc.identifier.issue
5
abbreviated journal
dc.identifier.jabbrev
ASTRON J
Journal
dc.identifier.jtitle
ASTRONOMICAL JOURNAL
Volume Number
dc.identifier.volume
120
Release Date
dc.description.issuedate
2000
department of Author
dc.contributor.institution
Komplex Rendszerek Fizikája Tanszék
Author institution
dc.contributor.department
Komplex Rendszerek Fizikája Tanszék


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Optical and infrared colors of stars observed by the Two Micron All Sky Survey and the Sloan Digital Sky Survey
 

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