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[vsnet-sequence 127] Sequence for V838 Mon
Norwegian Astronomical Society - Variable Star Section
***** Sequence for V838 Monocerotis *****
0659-03 V838 Mon R.A. = 07h04m04s.8, Decl.= -03o50'51" (2000.0)
This list contains photometry for bright comparison stars around
V838 Mon. Star names are from Yale Bright Star Catalogue (HR
numbers), Henry Draper Catalogue and its extension (HD). The
Flamsteed name is given for the brightest star. The sequence contains
V magnitudes and B-V colours with corresponding uncertainties. Only
apparently single stars with B-V < +0.7 have been selected.
References for photometry are the UBV Photometric System catalogue
(J.-C. Mermilliod and M. Mermilliod, 1998), Tycho-2 catalogue (E. Hog
et al., 2000), CCD photometry by A. Henden, USNO, obtained from
ftp://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/ . The method by
M. Bessell (PASP, 112, 961, 2000) was used in transforming Tycho-2
BT and VT photometry to V and B-V. Last column gives the angular
distances from V838 Mon. This sequence may be used for visual
observations as well as PEP/CCD photometry with proper filters.
---------------------------------------------------------------------
Id R.A. (2000.0) Decl. Star Name Vmag sV B-V sB-V Ref Dist
h m s o ' " '
---------------------------------------------------------------------
A 07 02 54.8 -04 14 21 19 Mon 4.98 0.01 -0.20 0.01 UBVcat 29.3
B 06 54 24.7 -01 07 37 HR 2572 5.44 0.00 +0.17 0.01 UBVcat 218.3
C 06 50 49.8 -00 32 27 HR 2530 5.76 0.00 +0.39 0.00 UBVcat 280.7
D 07 00 18.0 -05 22 02 HR 2622 6.29 0.01 +0.57 0.00 UBVcat 107.3
E 06 50 43.3 -04 15 58 HD 49935 6.86 0.02 -0.10 0.02 Tycho2 201.4
F 07 03 37.2 -02 28 27 HD 53085 7.20 0.02 -0.11 0.02 Tycho2 82.7
G 07 03 25.4 -03 01 31 HD 53056 7.47 0.01 +0.14 0.00 UBVcat 50.3
H 06 58 57.2 -04 01 07 HD 51871 7.75 0.02 -0.04 0.02 Tycho2 77.4
J 07 04 20.9 -03 03 02 HD 53299 8.17 0.01 +0.70 0.02 UBVcat 48.0
K 07 02 04.3 -04 01 11 HD 52691 8.48 0.02 +0.37 0.03 Tycho2 31.8
L 07 03 49.7 -03 59 57 HD 53135 9.09 0.03 +0.01 0.03 Tycho2 9.8
M 07 04 55.6 -03 55 42 HD 53426 9.45 0.04 +0.29 0.05 Tycho2 13.6
N 07 02 25.0 -03 53 23 HD 296116 9.66 0.05 +0.32 0.05 Tycho2 25.0
P 07 03 25.8 -03 51 41 HD 296109 10.09 0.02 +0.37 0.02 Henden 9.8
R 07 04 09.5 -03 53 01 HD 296278 10.71 0.02 +0.04 0.02 Henden 2.5
---------------------------------------------------------------------
Notes:
Star L: Henden has V = 9.14 (+/- 0.03) and B-V = +0.10 (+/-0.05).
Star P: Tycho-2 gives V = 10.21 (+/-0.07) and B-V = +0.29 (+/-0.08).
Star R: Tycho-2 gives V = 10.61 (+/-0.09) and B-V = +0.10 (+/-0.09).
A short list of red stars (B-V > +1.2) is also included for colour
calibration:
---------------------------------------------------------------------
Id R.A. (2000.0) Decl. Star Name Vmag sV B-V sB-V Ref Dist
h m s o ' " '
---------------------------------------------------------------------
1 07 04 05.2 -05 19 26 HD 53208 5.61 0.01 +1.29 0.00 UBVcat 88.6
2 07 02 06.7 -03 45 17 HD 52690 6.60 0.02 +1.61 0.03 Tycho2 30.0
3 07 03 26.7 -04 15 59 HD 53033 7.40 0.02 +1.39 0.03 Tycho2 26.9
4 07 03 17.4 -04 01 04 HD 53006 8.17 0.02 +1.56 0.05 Tycho2 15.6
5 07 03 58.3 -04 03 48 HD 296134 9.23 0.04 +1.55 0.10 Tycho2 13.0
---------------------------------------------------------------------
Acknowledgments:
I would like to thank Brian Skiff, Lowell Observatory, for very
helpful comments. In preparing this sequence I made use of the
web services of General Catalogue of Photometric Data and VizieR
Service of Centre de Donnees astronomiques de Strasbourg.
2002 February 4,
Bjorn H. Granslo
vsnet-adm@kusastro.kyoto-u.ac.jp
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