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Norwegian Astronomical Society - Variable Star Section
***** Sequence for the Recurrent Nova RS Ophicuhi *****
Compiled by Bjorn H. Granslo (version 2003 May 31)
1744-06 RS Oph [R.A. = 17h50m13s.2, Decl. = -06o42'28" (2000.0)]
GCVS (Kholopov et al. 1985) has mag. 4.3 - 12.5 V, type NR and spectrum
OB+M2ep. RS Oph has shown major outbursts in 1898, 1933, 1958, 1967 and
1985, and possibly also in 1945 (Oppenheimer and Mattei 1993, Malatesta
2000).
*** 1. Sequence Stars ***
This list contains stars with B-V from 0.0 to 1.0 and should serve as
a suitable set of comparison stars for RS Ophiuchi.
Id R.A. (2000.0) Decl. Star Name V-mag sV B-V sB-V Source
h m s o ' "
A 18 00 38.7 +02 55 54 67 Oph 3.97 0.01 0.02 0.02 GCPD
B 18 00 29.0 -03 41 25 Zeta Ser 4.62 0.01 0.38 0.01 GCPD
C 17 30 23.8 -01 03 46 HR 6516 5.31 0.01 0.72 0.01 GCPD
D 17 33 29.9 -05 44 41 HR 6534 5.62 0.01 0.18 0.01 GCPD
E 17 43 47.0 -07 04 47 HR 6601 6.31 0.02 0.37 0.01 GCPD
F 17 52 37.1 -05 15 43 HD 162713 6.84 0.02 1.01 0.02 See note
G 17 59 04.7 -05 02 54 HD 163976 7.41 0.01 0.57 0.01 GCPD
H 17 44 34.7 -07 24 30 HD 161203 8.02 0.01 0.69 0.03 See note
K 17 51 42.4 -06 15 36 HD 162506 8.38 0.03 0.36 0.04 Tycho2
L 17 47 37.6 -06 33 57 HD 161753 9.12 0.03 0.64 0.04 Tycho2
M 17 51 00.7 -06 53 42 HD 162369 9.56 0.04 0.60 0.05 Tycho2
N 17 51 24.5 -06 53 05 HD 162449 9.86 0.02 0.48 0.02 Henden
P 17 48 42.1 -06 41 12 BD -06 4665 10.45 0.03 0.80 0.11 See note
R 17 49 34.6 -06 55 39 BD -06 4659 10.88 0.03 0.52 0.15 See note
S 17 49 46.8 -06 44 51 TYC 5094-0061 11.49 0.01 0.71 0.01 Henden
T 17 50 32.0 -06 39 07 GSC 5094-0310 12.12 0.01 0.84 0.01 Henden
U 17 50 02.8 -06 50 13 GSC 5094-0335 12.90 0.02 0.86 0.01 Henden
W 17 49 51.7 -06 38 57 GSC 5094-0064 13.02 0.01 0.91 0.01 Henden
X 17 50 06.2 -06 43 50 GSC 5094-0650 13.26 0.01 1.02 0.01 Henden
Notes:
Stars A-E, G and H: V magnitudes and B-V colours are mean values
derived from data at GCPD, The Lausanne Photometric Database.
Star A: Multiple, brightest components of mag. 4.0 and 8.1, sep. 54".5
(Worley and Douglass 1997).
Star C: Binary (Struve 2173), mag. 6.0 and 6.2, a = 0".98, P = 46.4a
(Worley and Douglass 1997).
Stars F, H-M, P and R: 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).
Star F: V and B-V is mean of Kornilov et al. (1991) and Tycho2.
Star H: V is derived from GCPD, B-V is derived from Tycho2.
Star L: Double star (RST 4576), mag. 9.0 and 12.3, sep. 2".6
(Worley and Douglass 1997).
Star N: Photometry is from a single night, estimated errors are given.
Star P-R: V is from ASAS3, B-V is derived from Tycho2.
Star S-X: Photometry is based on three nights of data.
Star S: Rc = 11.04 (+/- 0.01) from Henden photometry; V = 11.47
(+/- 0.03) from CCD photometry on five nights by the compiler.
Star T: Rc = 11.58 (+/- 0.02) from Henden photometry.
Star U: Rc = 12.34 (+/- 0.02) from Henden photometry.
Star W: Rc = 12.43 (+/- 0.01) from Henden photometry.
Star X: Rc = 12.60 (+/- 0.02) from Henden photometry.
*** 2. Other Reference Stars ***
These quite red stars (B-V between 1.2 and 1.7) are apparently
constant in brightness and may be used as colour calibrators.
Id. R.A. (2000) Decl. Star Name V-mag sV B-V sB-V Source
h m s o ' "
J 17 50 12.7 -06 47 25 HD 162215 9.31 0.01 1.23 0.01 Henden
Q 17 50 24.6 -06 50 06 TYC 5094-0725 11.12 0.01 1.68 0.01 Henden
Y 17 50 08.4 -06 49 04 GSC 5094-0237 12.62 0.01 1.58 0.01 Henden
Z 17 50 44.0 -06 33 38 GSC 5094-0434 13.19 0.01 1.54 0.01 Henden
Notes:
Stars J, Q, Y and Z: Photometry is based on three nights of data.
Star J: Rc = 8.60 (+/- 0.01) from Henden photometry. 4'.9 S of RS Oph.
Star Q: Rc = 10.19 (+/- 0.01) from Henden photometry.
Star Y: Rc = 11.71 (+/- 0.01) from Henden photometry.
Star Z: Rc = 12.27 (+/- 0.01) from Henden photometry.
Acknowledgements:
The VizieR Service at Centre de Donnees astronomiques de Strasbourg,
The Lausanne General Catalogue of Photometric Data (GCPD), The All
Sky Automated Survey (ASAS) web site have been extensively used in
preparing this sequence. I would also like to thank Dr. A. Henden,
USNO, Flagstaff, AZ, USA for providing accurate photometry for the
fainter stars around RS Ophicuhi.
References:
Bessell M.: 2000, "The Hipparcos and Tycho Photometric System
Passbands", Publ. Ast. Soc. Pacific, 112, 961.
Henden A.: 2003, CCD photometry files for the field of RS Oph.
URLs: ftp://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/rsoph.dat ,
ftp://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/rsopha.dat ,
ftp://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/rsophb.dat .
Hog E. et al.: 2000, "The Tycho-2 Catalogue of the 2.5 Million
Brightest Stars", Astron. Astrophys. 355, L27. [Tycho2]
Kholopov P. N. et al.: 1985, "General Catalogue of Variable Stars,
4th Edition", Nauka, Moscow. [GCVS]
Kornilov V. G. et al.: 1991, "The WBVR Photometric Catalog",
Tr. Gos. Astron. Inst. Shternberga, Tom 63.
Malatesta K.: 2000, "AAVSO: RS Oph, May 2000 Variable Star of the
Month". URL: http://www.aavso.org/vstar/vsotm/0500.stm .
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]
Oppenheimer B. D., and Mattei J. A.: 1993, "Analysis of Long-Term AAVSO
Observations of RS Ophiuchi", Journ. AAVSO, 22, 105.
Pojmansky G.: "The All Sky Automated Survey". V magnitudes
derived from measurements with the ASAS-3 system [ASAS3].
URL: http://www.astrouw.edu.pl/~gp/asas/asas.html .
Worley C. E., and Douglass, G. G.: 1997, "The Washington Visual Double
Star Catalog, 1996.0", Astron. Astrophys. Suppl. Ser. 125, 523.
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