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Norwegian Astronomical Society - Variable Star Section
***** Sequence for the Gamma Cas type Variable X Persei *****
0349+30 X PERSEI [R.A. = 03h55m23s.1, Decl. = +31o02'45" (2000.0)]
Compiled by Bjorn H. Granslo (version 2003 July 30):
X Persei = HR 1209 = HD 24534 = TYC 2357-2042. GCVS (Kholopov et al.
1998) has type GCAS+XP, mag. 6.03 - 7.0 V and spectral type
O9.5(III-V)ep. GCPD has V = 6.19 (+/- 0.21) and B-V = 0.27 (+/- 0.05)
(mean of 10 UBV measurements).
*** Sequence Stars for the Field of X Persei ***
This list contains identifications, positions and photometry (V, B-V)
for comparison stars with B-V from 0.0 to 0.9. All stars are located
within 3-4 deg. from X Persei. Stars B to F should serve as useful
comparisons for visual estimates of X Per. For differential photometry
with PEP or CCD (with V and/or B filters) the preferred comparson star
is C, while M may be used as a check star or nearby reference.
Id R.A. (2000.0) Decl. Star Name V-mag sV B-V sB-V Source
h m s o ' "
A 03 56 28.7 +35 04 51 HR 1215 5.49 0.02 -0.03 0.01 GCPD
B 03 51 53.7 +34 21 33 HR 1191 5.77 0.02 0.00 0.01 GCPD
C 03 52 04.4 +31 10 07 HR 1197 6.24 0.01 0.20 0.01 GCPD
D 03 46 40.9 +32 17 25 HD 23478 6.66 0.02 0.06 0.02 GCPD
E 03 52 39.7 +32 24 31 HD 24228 6.74 0.01 0.91 0.01 GCPD
F 04 01 25.9 +28 30 07 HD 25228 7.08 0.01 0.17 0.01 GCPD
G 03 49 07.3 +32 15 52 HD 23802 7.45 0.02 0.17 0.01 GCPD
H 03 50 58.7 +29 39 18 HD 24052 7.96 0.02 0.50 0.03 Tycho-2
K 03 50 27.5 +31 33 13 HD 23974 8.55 0.02 0.27 0.03 Tycho-2
L 03 53 35.5 +30 46 24 HD 281309 9.17 0.04 0.60 0.05 Tycho-2
M 03 54 20.7 +30 59 55 HD 281305 9.55 0.04 0.49 0.04 Tycho-2
Notes on photometry:
Stars A-G: V magnitudes and B-V colours are derived from data obtained
at GCPD, The Lausanne Photometric Database [GCPD].
Stars H-M: V magnitudes and/or B-V colours are derived from Tycho-2 BT
and VT photometry (Hog et al. 2000) by using the correction procedure
of Bessell (2000).
Other notes:
Star A: HD 24640 = TYC 2365-1420. Possible variable NSV 1418,
type BCEP?, mag. 5.45 - 5.51 V [NSV].
Star B: HD 24131 = TYC 2364-0958. Possible variable NSV 15818. Double
star KUI 14, mag. 5.8 and 13.2, sep. 15".1 [WDS].
Star C: HD 24167 = TYC 2356-1913.
Star D: TYC 2360-0780. Possible variable NSV 15770, NSV Supplement
Catalog has type BCEP?, amplitude 0.02 mag.
Star E: TYC 2360-1950.
Star F: TYC 1825-0856.
Star G: TYC 2360-0665. Double star STT 516, VT-mag. 7.60 and 9.63
[Tycho-2], sep. 2".2 [WDS], combined photometry given in sequence.
Possible variable NSV 1340, type BCEP?, mag. 7.44 - 7.47 V [NSV].
Star H: TYC 1812-1420. Multiple star STF 459, comp. AB, mag. 7.9 and
10.5, sep. 12".8; AC, 8.2 and 13.4, 53".7 [WDS]. GCPD has V = 7.94.
Star K: TYC 2356-0566. Rydgren (1971) has V = 8.59.
Star L: TYC 2356-1674.
Star M: TYC 2357-0326. This star is located 13'.7 from X Per.
Acknowledgements:
The VizieR Service at Centre de Donnees astronomiques de Strasbourg
and The Lausanne General Catalogue of Photometric Data (GCPD) web
sites have been used in preparing this sequence.
References:
Bessell M.: 2000, "The Hipparcos and Tycho Photometric System
Passbands", Publ. Ast. Soc. Pacific, 112, 961.
Hog E. et al.: 2000, "The Tycho-2 Catalogue of the 2.5 Million
Brightest Stars", Astron. Astrophys. 355, L27 [Tycho-2, TYC].
Kazarovets E. V., Durlevich O. V., Samus N. N.: 1998, "New Catalogue
of Suspected Variable Stars. Supplement - Version 1.0", Institute of
Astronomy of Russian Academy of Sciences and Sternberg Astronomical
Institute [NSV].
Kholopov P. N. et al.: 1998, "Combined General Catalogue of Variable
Stars, 4.1 Edition". The most updated version of GCVS is at
http://www.sai.msu.su/groups/cluster/gcvs/gcvs/ [GCVS].
Mermilliod J.-C., Hauck B., Mermilliod M.: "The General Catalogue of
Photometric Data", University of Lausanne, Switzerland.
URL: http://obswww.unige.ch/gcpd/gcpd.html [GCPD].
Rydgren A. E.: 1971, "uvby-beta Photometry of Stars in the Direction of
the Association Perseus OB 2", Publ. Astron. Soc. Pacific, 83, 656.
Worley C. E., Douglass G. G.: 1996, "The Washington Visual Double Star
Catalog, 1996.0", US Naval Observatory.
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