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J/A+A/461/977   Rosat North Ecliptic survey stellar population   (Micela+, 2007)

The stellar population of the Rosat North Ecliptic survey. Micela G., Affer L., Favata F., Henry J.P., Gioia I., Mullis C.R., Sanz-Forcada J., Sciortino D. <Astron. Astrophys. 461, 977 (2007)> =2007A&A...461..977M
ADC_Keywords: Surveys ; Radio sources ; Photometry, infrared ; MK spectral classification Keywords: stars: activity - stars: coronae - X-rays: stars - solar neighbourhood Abstract: X-ray surveys are a very efficient mean of detecting young stars and therefore allow us to study the young stellar population in the solar neighborhood and the local star formation history in the last billion of years. We want to study the young stellar population in the solar neighborhood, to constrain its spatial density and scale height as well as the recent local star formation history. We analyze the stellar content of the ROSAT North Ecliptic Pole survey, and compare the observations with the predictions derived from stellar galactic model. Since the ROSAT NEP survey is sensitive at intermediate fluxes is able to sample both the youngest stars and the intermediate age stars (younger than 109years), linking the shallow and deep flux surveys already published in the literature. We confirm the existence of an excess of yellow stars in our neighborhood previously seen in shallow survey, which is likely due to a young star population not accounted for in the model. However the excellent agreement between observations and predictions of dM stars casts some doubt on the real nature of this active population. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 22 25 Standard stars table2.dat 75 152 Spectral types of program stars
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/ApJS/149/29 : ROSAT North Ecliptic Pole Survey (Gioia+, 2003) J/A+A/446/97 : NEP Distant Cluster Radio Galaxies (Branchesi+, 2006) J/ApJS/162/304 : ROSAT NEP X-ray source catalog (Henry+, 2006) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 A10 -- Name Star name 12- 18 A7 -- SpType MK spectral type 20- 22 A3 -- r_SpType Spectral type reference (1)
Note (1): Reference for SpType as follows: (1) = Jacoby et al. (1984, Cat. III/92) (2) = SIMBAD database. operated at CDS, Strasbourg, France
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 A2 --- --- [RX] 3- 14 A12 --- RX Source name (JHHMM.m+DDMM) from Gioia et al., 2003, Cat. J/ApJS/149/29 16- 19 A4 --- NEP North Ecliptic Pole scan number from Gioia et al., 2003, Cat. J/ApJS/149/29 21- 22 I2 h RAh Right ascension (J2000) 24- 25 I2 min RAm Right ascension (J2000) 27- 30 F4.1 s RAs Right ascension (J2000) 32 A1 --- DE- Declination sign (J2000) 33- 34 I2 deg DEd Declination (J2000) 36- 37 I2 arcmin DEm Declination (J2000) 39- 40 I2 arcsec DEs Declination (J2000) 42- 47 F6.3 mag Jmag ? J magnitude from 2MASS (Cat. II/246) 49- 54 F6.3 mag Hmag ? H magnitude from 2MASS (Cat. II/246) 56- 61 F6.3 mag Kmag ? K magnitude from 2MASS (Cat. II/246) 63- 70 A8 -- SpType MK spectral type 73- 75 A3 -- Note Notes (1)
Note (1): Note as follows: D = Discarded from the sample of the 'normal' stars S = Spectral type from SIMBAD G = Spectra from Gioia et al., 2003, Cat. J/ApJS/149/29 N = Spectra obtained in this work with the NOT telescope
Acknowledgements: Giusi Micela, giusi(at)
(End) Patricia Vannier [CDS] 27-Nov-2006
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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