J/other/Ap/48.304 BVRI of comparison stars in AGN fields (Doroshenko+, 2005)
BVRI CCD-Photometry of comparison stars in the neighborhood of galaxies
with active nuclei. II.
Doroshenko V.T., Sergeev S.G., Merkulova N.I., Sergeeva E.A.,
Golubinsky Y.V., Pronik V.I., Okhmat N.N.
<Astrophysics, 48, 304-320 (2005)>
=2005Ap.....48..304D 2005Ap.....48..304D
ADC_Keywords: Active gal. nuclei ; Photometry, UBVRI ; Photometry, CCD
Keywords: Extragalactic astronomy - AGN: comparison stars: optical photometry
Abstract:
Results are presented from CCD BVRI-observations of 145 comparison
stars in the neighborhoods of 14 Seyfert galaxies, 3 quasars, and 5
BL Lac objects with right ascensions of 12 to 24 hours. The magnitudes
of the observed stars ranged from V=11 to V=17. The typical
photometric error for stars brighter V=14 is 0.01m. The B, V, Rc, and
Ic magnitudes of most of these stars were not known previously.
14'x14' finding charts are provided. These results can be used for
differential photometry of the nuclei of active galaxies in the B, V,
Rc, and Ic bands.
Description:
All the observations were made on the 70cm telescope at the Crimean
Astrophysical Observatory using an AP7p CCD camera.
The camera is equipped with a set of B, V, R, R1, and I filters, where
the filter we have denoted by R1 corresponds better to the I filter in
the Cousins system, while the other filters correspond better to the
filters in the standard Johnson system.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fields.dat 35 22 AGN field positions
table2.dat 108 151 BVRcIc magnitudes of comparison stars in the
AGN fields
table3.dat 41 56 Cross identification of some stars
refs.dat 66 14 References
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See also:
J/AJ/122/2055 : UBVRIJHK photometry of AGN field stars (Gonzalez-Perez+, 2001)
J/A+AS/116/403 : VRI photometry of stars in 12 BL Lac objects (Fiorucci+, 1996)
J/A+AS/130/109 : BV(RI)c photometry of ON 231 (Tosti+ 1998)
J/ApJS/115/185 : 3C 390.3 BVRI and H photometry (Dietrich+, 1998)
Byte-by-byte Description of file: fields.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Field Field designation
14- 15 I2 h RAh Right ascension (J2000)
17- 18 I2 min RAm Right ascension (J2000)
20- 23 F4.1 s RAs Right ascension (J2000)
25 A1 --- DE- Declination sign (J2000)
26- 27 I2 deg DEd Declination (J2000)
29- 30 I2 arcmin DEm Declination (J2000)
32- 35 F4.1 arcsec DEs Declination (J2000)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Field Field designation
14- 15 A2 --- Star Object Designation in our field (G1)
17- 20 A4 --- n_Star Note on Star (1)
22- 23 I2 h RAh Right ascension (J2000)
25- 26 I2 min RAm Right ascension (J2000)
28- 31 F4.1 s RAs Right ascension (J2000)
33 A1 --- DE- Declination sign (J2000)
34- 35 I2 deg DEd Declination (J2000)
37- 38 I2 arcmin DEm Declination (J2000)
40- 43 F4.1 arcsec DEs Declination (J2000)
45- 50 F6.3 mag Bmag Average Johnson B magnitude
52- 56 F5.3 mag e_Bmag rms uncertainty on Bmag
58- 63 F6.3 mag Vmag Average Johnson V magnitude
65- 69 F5.3 mag e_Vmag rms uncertainty on Vmag
71- 76 F6.3 mag Rmag Average Johnson R magnitude
78- 82 F5.3 mag e_Rmag rms uncertainty on Rmag
84- 89 F6.3 mag Ic1mag Average R1 (close to Ic) magnitude (2)
91- 95 F5.3 mag e_Ic1mag rms uncertainty on Ic1mag
97-102 F6.3 mag Ic2mag Average I magnitude (2)
104-108 F5.3 mag e_Ic2mag rms uncertainty on Ic2mag
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Note (1): Notes as follows:
var = variable stars
* = star which we have chosen as a principal star in the field of
a given galaxy. Initial B, V, Rc, and Ic magnitudes were taken
from Gonzalez-Perez et al., 2001, Cat. J/AJ/122/2055.
Note (2): Since our filter R1 is close to the I filter in the Cousins
system, we obtained two different versions of the Ic magnitudes:
one system was determined from observations in the R1 filter and
the corresponding column in Table 2 is labelled Ic1, and the other
Ic system was obtained from observations with the I filter and the
corresponding column in Table 2 is labelled Ic2. It is easy to
confirm that columns Ic1 and Ic2 give almost identical values,
which confirms the validity of our transformation equations.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Field Field designation
14- 15 A2 --- Star Star designation in the field (G1)
17- 18 A2 --- OName1 Other name
21- 25 A5 --- r_OName1 Reference for OName1, separated by comma
27- 28 A2 --- OName2 Other name
31- 35 A5 --- r_OName2 Reference for OName2, separated by comma
37- 38 A2 --- OName3 Other name
40- 41 A2 --- r_OName3 Reference for OName3
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- Ref Reference code
4- 22 A19 --- BibCode BibCode
24- 44 A21 --- Aut Author's name
46- 66 A21 --- Com Comments
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Global notes:
Note (G1): Nomenclatude note:
Simbad designation: [DSM2005] Field Star
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 13-Jun-2006