J/A+A/590/A116 Nainital-Cape Survey. IV. (Joshi+, 2016)
The Nainital-Cape Survey.
IV. A Search for pulsational variability in 108 chemically peculiar stars.
Joshi S., Martinez P., Chowdhury S., Chakradhari N.K., Joshi Y.C.,
van Heerden P., Medupe T., Kumar Y. B., Kuhn R.B.
<Astron. Astrophys. 590, A116 (2016)>
=2016A&A...590A.116J 2016A&A...590A.116J
ADC_Keywords: Surveys ; Stars, peculiar ; Stars, variable ;
Photometry, uvby, beta
Keywords: asteroseismology - methods: observational - surveys -
stars: chemically peculiar - stars: oscillations
Abstract:
The Nainital-Cape Survey is a dedicated ongoing Survey programme to
search for and study pulsational variability in chemically peculiar
(CP) stars to understand their internal structure and evolution. The
main aims of this Survey are to find new pulsating Ap and Am stars in
the northern and southern hemisphere and to perform asteroseismic
studies of these new pulsators. The Survey is conducted using
high-speed photometry. The candidate stars were selected on the basis
of having Stromgren photometric indices similar to those of known
pulsating CP stars. Over the last decade a total of 337 candidate
pulsating CP stars were observed for the Nainital-Cape Survey, making
it one of the longest ground-based surveys for pulsation in CP stars
in terms of time span and sample size. The previous papers of this
series presented seven new pulsating variables and 229 null results.
In this paper we present the light curves, frequency spectra and
various astrophysical parameters of the 108 additional CP stars
observed since the last reported results. We also tabulated the basic
physical parameters of the known roAp stars. As a part of establishing
the detection limits in the Nainital-Cape Survey, we investigated the
scintillation noise level at the two observing sites used in this
Survey, Sutherland and Nainital, by comparing the combined frequency
spectra stars observed from each location. Our analysis shows that
both the sites permit the detection of variations of the order of
0.6-milli-magnitude (mmag) in the frequency range 1-4mHz, Sutherland
is on average marginally better.
Description:
For the Nainital-Cape Survey, the high-speed photometric observations
of Ap and Am star candidates are carried out from ARIES using a
high-speed photoelectric photometer attached to the 1.04-m
Sampurnanand telescope, the Modular Photometer attached to the 0.5-m
telescope and the University of Cape Town Photometer attached to the
0.75-m and 1.0-m telescopes at the Sutherland site of SAAO.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 109 61 The known roAp stars and their physical parameters
table2.dat 98 61 Additional parameters for the known roAp stars
table3.dat 251 108 Stars classified as null results during the
Nainital-Cape survey (108 stars)
refs.dat 80 54 References used in table1.dat
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See also:
J/A+A/542/A89 : Hvar survey for roAp stars. I. (Paunzen+, 2012)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq Serial Number of a star in the table
4- 5 A2 --- --- [HD]
6- 11 I6 --- HD ? HD no. of the star
13- 24 A12 --- OName Other (popular) name of the star
26- 27 I2 h RAh Right ascension (J2000)
29- 30 I2 min RAm Right ascension (J2000)
32- 33 I2 s RAs Right ascension (J2000)
35 A1 --- DE- Declination sign (J2000)
36- 37 I2 deg DEd Declination (J2000)
39- 40 I2 arcmin DEm Declination (J2000)
42- 43 I2 arcsec DEs Declination (J2000)
45- 57 A13 --- SpType MK spectral type
59- 63 F5.3 mag b-y ?=- b-y colour index
65- 69 F5.3 mag m1 ?=- m1 colour index
71- 75 F5.3 mag c1 ?=- c1 colour index
77- 82 F6.3 mag Dm1 ?=- Delta m1 spectral index
84- 89 F6.3 mag Dc1 ?=- Delta c1 spectral index
91- 95 F5.3 mag beta ?=- Hβ index
97-100 I4 K Teff Effective temperature of the star
102-109 A8 --- Ref Reference detailed in refs.dat file
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq Serial Number of a star in the table
4- 15 A12 --- Name Name of the star
17- 21 F5.2 mag Vmag Visual magnitude of the star
23- 27 F5.2 mas plx ?=- Parallax of the star
29- 34 F6.2 pc Dist ?=- Distance of the star
36- 39 F4.2 mag VMAG ?=- Absolute magnitude of the star
41- 44 F4.2 [Lsun] logLstar ?=- Luminosity of the star relative to the Sun
46- 50 F5.2 min Ppul Pulsation period of the star
52- 53 I2 muHz Deltamu ?=- Frequency separation in micro-hertz units
55- 59 F5.2 mmag Amax ?=- Maximum photometric amplitude variation
61- 64 F4.2 km/s RVmax ?=- Maximum radial velocity variation
65 A1 --- l_Prot Limit flag on Prot
66- 71 F6.2 d Prot ?=- Rotation Period of the star
73- 76 F4.2 [cm/s2] logg ?=- Surface gravity of the star
78- 81 F4.2 Msun Mstar ?=- Mass of the star relative to Sun
83- 86 F4.2 Rsun Rstar ?=- Radius of the star relative to Sun
88- 92 F5.2 kgauss B ?=- Mean longitudinal magnetic field of
the star
94- 98 F5.2 km/s vsini ?=- Projected rotational velocity of the star
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq Serial Number of a star in the table
5- 10 I6 --- HD HD no. of the star
12- 13 I2 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 19 I2 s RAs Right ascension (J2000)
21 A1 --- DE- Declination sign (J2000)
22- 23 I2 deg DEd Declination (J2000)
25- 26 I2 arcmin DEm Declination (J2000)
28- 29 I2 arcsec DEs Declination (J2000)
31- 35 F5.2 mag Vmag Visual magnitude of the star
38- 44 A7 --- SpType MK spectral type
45- 49 F5.2 mas plx ?=- Parallax of the star
51- 54 F4.2 mas e_plx ?=- Error in parallax
56- 61 F6.3 mag b-y ?=- b-y colour index
63- 68 F6.3 mag m1 ?=- m1 colour index
70- 74 F5.3 mag c1 ?=- c1 colour index
76- 80 F5.3 mag beta ?=- H Beta index
82- 87 F6.3 mag Dm1 ?=- Delta m1 spectral index
89- 94 F6.3 mag Dc1 ?=- Delta c1 spectral index
96-101 I6 K Teff ?=- Effective temperature of the star
103-107 F5.2 [Lsun] logLstar ?=- Luminosity of the star relative to the Sun
110-113 F4.2 h Deltat1 Duration of observation 1
115-118 I4 d HJD1 Julian date (2450000+) when the star was
observed
120-123 I4 --- Obs.Year1 Year when the star was observed
124 A1 --- --- [,]
126-129 F4.2 h Deltat2 ? Duration of observation 2
131-134 I4 d HJD2 ? Julian date (2450000+) when the star was
observed
136-139 I4 --- Obs.Year2 ? Year when the star was observed
140 A1 --- --- [,]
142-145 F4.2 h Deltat3 ? Duration of observation 3
147-150 I4 d HJD3 ? Julian date (2450000+) when the star was
observed
152-155 I4 --- Obs.Year3 ? Year when the star was observed
156 A1 --- --- [,]
158-161 F4.2 h Deltat4 ? Duration of observation 4
163-166 I4 d HJD4 ? Julian date (2450000+) when the star was
observed
168-171 I4 --- Obs.Year4 ? Year when the star was observed
172 A1 --- --- [,]
174-177 F4.2 h Deltat5 ? Duration of observation 5
179-182 I4 d HJD5 ? Julian date (2450000+) when the star was
observed
184-187 I4 --- Obs.Year5 ? Year when the star was observed
188 A1 --- --- [,]
190-193 F4.2 h Deltat6 ? Duration of observation 6
195-198 I4 d HJD6 ? Julian date (2450000+) when the star was
observed
200-203 I4 --- Obs.Year6 ? Year when the star was observed
204 A1 --- --- [,]
206-209 F4.2 h Deltat7 ? Duration of observation 7
211-214 I4 d HJD7 ? Julian date (2450000+) when the star was
observed
216-219 I4 --- Obs.Year7 ? Year when the star was observed
220 A1 --- --- [,]
222-225 F4.2 h Deltat8 ? Duration of observation 8
227-230 I4 d HJD8 ? Julian date (2450000+) when the star was
observed
232-235 I4 --- Obs.Year8 ? Year when the star was observed
236 A1 --- --- [,]
238-241 F4.2 h Deltat9 ? Duration of observation 9
243-246 I4 d HJD9 ? Julian date (2450000+) when the star was
observed
248-251 I4 --- Obs.Year9 ? Year when the star was observed
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 46 A23 --- Aut Author's name
49- 80 A32 --- Com Comments
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Acknowledgements:
Santosh Joshi, santosh(at)aries.res.in
References:
Martinez et al., Paper I 2001A&A...371.1048M 2001A&A...371.1048M
Joshi et al., Paper II 2006A&A...455..303J 2006A&A...455..303J
Joshi et al., Paper III 2009A&A...507.1763J 2009A&A...507.1763J
(End) Patricia Vannier [CDS] 25-Apr-2016