J/AJ/115/193 RR Lyrae V light curves (Layden, 1998)
RR Lyrae variables in the inner halo. I. Photometry.
Layden A.C.
<Astron. J. 115, 193 (1998)>
=1998AJ....115..193L 1998AJ....115..193L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Photometry, CCD
Keywords: Galaxy: halo - Galaxy: stellar content - stars: distances -
stars: Population II - stars: variables: other
Abstract:
I present V-band CCD photometry for a sample of 103 RR Lyrae variables
selected from the General Catalogue of Variable Stars to lie in the
inner halo of the Galaxy. I also describe a method for obtaining the
mean apparent magnitude and the epoch at maximum light of an RR Lyrae
star. The method requires as few as five photometric observations, and
simulations demonstrate that the associated errors are relatively
small. I employ this method to derive the mean magnitudes and maximum
light epochs of the 103 RR Lyrae stars observed. These stars were
selected, based on their Galactic coordinates and original
photographic photometry, to lie near their orbital tangent points,
thus providing a sample well suited for measuring the rotational
kinematics of the inner halo. Using interstellar reddenings from the
literature and the observed mean V magnitudes, I derive distances for
these stars and show that their actual locations in the Galaxy are
indeed suitable for use in a kinematic study, despite the large
zero-point errors in the survey photographic photometry.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 44 915 Individual photometric observations
table3.dat 82 106 Derived light-curve parameters
table4.dat 40 51 Six light-curve templates
--------------------------------------------------------------------------------
See also:
II/214 : Combined General Catalogue of Variable Stars (Kholopov+ 1998)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Star Star name
11- 23 F13.5 d HJD Heliocentric Julian date of mid-observation
25- 29 F5.3 --- Phase Derive photometric phase
31- 36 F6.3 mag Vmag Johnson V magnitude
38- 42 F5.3 mag e_Vmag rms uncertainty on Vmag
44 I1 --- Run [1/8] Observing run number (1)
--------------------------------------------------------------------------------
Note (1): 1: 1993 Jan 8-9
2: 1993 Apr 9-13
3: 1993 May 20-22, 26
4: 1993 Aug 6-8
5: 1993 Aug 28-31
6: 1993 Sep 28
7: 1993 Oct 27-29, Nov 2
8: 1994 June 17-20, 26-27
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Star Star name
11- 12 I2 h RAh Right ascension (J2000.0)
14- 15 I2 min RAm Right ascension (J2000.0)
17- 21 F5.2 s RAs Right ascension (J2000.0)
23 A1 --- DE- Declination sign (J2000.0)
24- 25 I2 deg DEd Declination (J2000.0)
27- 28 I2 arcmin DEm Declination (J2000.0)
30- 33 F4.1 arcsec DEs Declination (J2000.0)
35- 38 F4.2 mag AV Interstellar absorption in V band
40- 48 F9.7 d Per ? Adopted period
50- 51 I2 10-5d e_Per ? rms uncertainty on Per (99: e_Per>10-3d)
54 I1 --- n_Per [1/3]? Origin of the period (1)
56- 60 F5.2 mag <Vmag> ? Average V magnitude
62- 73 F12.4 d Emax ? Epoch (Julian date) at maximum light
75- 79 F5.3 d e_Emax ? rms uncertainty on Emax
81- 82 I2 --- Nobs ? Number of observations
--------------------------------------------------------------------------------
Note (1): 1: PGCVS4 (Cat. II/214) was adopted for the star
2: the adopted period is at most a few percent away from PGCVS4
(Cat. II/214)
3: the adopted period is farther away from PGCVS4 (Cat. II/214),
and hence more questionable
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 F4.2 --- Phase Phase
6- 10 F5.3 --- V1 Template 1 V magnitude
12- 16 F5.3 --- V2 Template 2 V magnitude
18- 22 F5.3 --- V3 Template 3 V magnitude
24- 28 F5.3 --- V4 Template 4 V magnitude
30- 34 F5.3 --- V5 Template 5 V magnitude
36- 40 F5.3 --- V6 Template 6 V magnitude
--------------------------------------------------------------------------------
History: From AJ electronic version
(End) James Marcout, Patricia Bauer [CDS] 09-Mar-1999