J/MNRAS/238/709 NPG stars VIJHK photometry (Stobie+ 1989)
Distance errors and the stellar luminosity function
Stobie R.S., Ishida K., Peacock J.A.
<Mon. Not. R. Astron. Soc. 238, 709 (1989)>
=1989MNRAS.238..709S 1989MNRAS.238..709S (SIMBAD/NED BibCode)
ADC_Keywords: Photometry ; Stars, distances
Abstract:
A study of the stellar luminosity function in the region of the north
galactic pole (NPG) is described. The method is based on photometric
parallaxes derived from the V-I colour index. A complete sample of
stars is defined with I<16, V>13, V-I>1.5 and within 130pc of the Sun.
JHK photometry is obtained for stars with V-I>2.9 to check the V-I
calibration and exclude contamination by giants. It is demonstrated
that application of the classical Malmquist bias derives an incorrect
luminosity function. A detailed discussion is given of the effects of
Malmquist-type biases on luminosity functions and a method presented
which effectively deconvolves the observed luminosity function to
determine the intrinsic luminosity function. The method is applied to
the data in the north galactic pole sample. The derived main sequence
luminosity function is in good agreement with other determinations
based on the method of photometric parallaxes, showing a clear peak at
Mv~+11.5 to +12 and a well-defined decrease thereafter to Mv=+15.
Fainter than Mv=+15, the luminosity function is not defined by the
present study.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
appena 53 178 List of North Galactic Pole (NGP) stars within
130 pc of the Sun
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Byte-by-byte Description of file: appena
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (1950)
4- 5 I2 min RAm Right ascension (1950)
7- 10 F4.1 s RAs Right ascension (1950)
12 A1 --- DE- Declination sign
13- 14 I2 deg DEd DEclination (1950)
16- 17 I2 arcmin DEm DEclination (1950)
19- 20 I2 arcsec DEs DEclination (1950)
22- 26 F5.2 mag Vmag V magnitude
28- 32 F5.2 mag Imag I magnitude
34- 37 F4.2 mag V-I V-I colour index
39- 43 F5.2 mag Kmag ? K magnitude
45- 48 F4.2 mag J-K ? J-K colour index
50- 53 F4.2 mag H-K ? H-K colour index
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History: Prepared via OCR at CDS.
(End) Marie-Jose Wagner, Patricia Bauer [CDS] 29-Apr-1997