J/A+A/345/505 UBVI magnitudes of NGC 869 B-type pulsators (Krzesinski+, 1999)
B-type pulsators in the central region of NGC 869 (h Persei)
Krzesinski J., Pigulski A., Kolaczkowski Z.
<Astron. Astrophys. 345, 505 (1999)>
=1999A&A...345..505K 1999A&A...345..505K
ADC_Keywords: Binaries, eclipsing ; Stars, B-type ; Photometry, UBVRI
Keywords: stars: binaries: eclipsing - stars: oscillations -
stars: variables: general -
Galaxy: open clusters and associations: individual: NGC 869 = h Per
Abstract:
In the course of the search for B-type pulsators in the central region
of h Persei, we discovered two β Cephei stars, Oo692 and Oo992,
and one SPB star, Oo893. The first two stars are monoperiodic
pulsators with periods of 0.1716946 and 0.1326359 d respectively, and
semi-amplitudes smaller than 0.01mag. The light curve of Oo893 can be
described by a single 1.193633-day period, slightly non-sinusoidal in
shape, and having semi-amplitudes from 19 mmag in I to 48 mmag in U.
Oo893 is the first SPB star found in h and χ Persei. In addition,
we discovered seven other variables, including three eclipsing
binaries and one λ Eri star. One of the binaries is a
W UMa-type star and a likely cluster member. We also present new UBV
photometry for 258 stars in the field. The average reddening,
estimated from the cluster colour-colour diagram, amounts to
E(B-V)=0.52mag. A 0.1mag dispersion of reddenings within the cluster
is also seen.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 104 311 UBV photometry of stars in h Persei
curves/* . 10 Individual UBVI light curves
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See also:
J/A+A/325/987 : UBV magnitude of NGC 884 B-type pulsators (Krzesinski+ 1997)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 5 F5.1 pix Xpos X position (1)
7- 11 F5.1 pix Ypos Y position (1)
13- 16 I4 --- OO ? Oosterhoff (1937AnLei..17a...1O 1937AnLei..17a...1O) number
(NGC 869 NNNN in Simbad)
18- 20 I3 --- W ? Wildey (1964ApJS....8..439W 1964ApJS....8..439W) number
(Cl* NGC 869 W NNNa in Simbad)
21- 22 A2 --- m_W [ab :] Multiplicity index or uncertainty flag
on W
24- 28 I5 --- MV ? Moffat & Vogt (1974VeBoc...2....1M 1974VeBoc...2....1M) number
(Cl* NGC 869 MV NNNNN in Simbad)
29 A1 --- m_MV [ABCD] Multiplicity index on MV
30 A1 --- u_MV Uncertainty flag on MV
32- 37 F6.3 mag Vmag ? V magnitude
39- 43 F5.3 mag B-V ? B-V colour index
45- 47 A3 --- r_B-V Reference to BV photometry (2)
49 A1 --- n_B-V [I] I: BV photometry transformed with the use
of I-filter measurements
51- 55 F5.3 mag U-B ? U-B colour index
57 I1 h RAh Right ascension (J2000.0)
59- 60 I2 min RAm Right ascension (J2000.0)
62- 66 F5.2 s RAs Right ascension (J2000.0)
68 A1 --- DE- Declination sign (J2000.0)
69- 70 I2 deg DEd Declination (J2000.0)
72- 73 I2 arcmin DEm Declination (J2000.0)
75- 78 F4.1 arcsec DEs Declination (J2000.0)
80- 94 A15 --- Rem Remarks
96-105 A10 --- VarFile Name of the File containing light curves in
subdirectory curves
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Note (1): 1pix∼0.15', see figure 1.
Note (2): S: star was observed from Suhora only
B: star was observed from Bialkow only
S+B: star was observed form Suhora and Bialkow
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Byte-by-byte Description of file: curves/*
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Bytes Format Units Label Explanations
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1 A1 --- Filter [UBVI] Filter
3- 14 F12.4 d HJD Heliocentric Julian date
16- 22 F7.4 mag Dmag Differential magnitude in Filter band
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Acknowledgements: Andrzej Pigulski
History:
* 15-Nov-2001: In the light curves (files curves/*) the HJD was corrected
following a message by the author (Jurek Krzesinski, ):
the HJD had been incorrectly interpretated (too early by 600days)
* 28-Feb-2002: the first digit of the Wildey number, omitted, was replaced.
* 27-Aug-2002: the multiplicity letter for unresolved multiples was modified:
it is now A, B, C, D, according to decreasing brightness (from authors)
(End) Patricia Bauer [CDS] 22-Apr-1999