J/AJ/137/4598 VR light curve of ASAS-North Cepheids (Schmidt+, 2009)
Photometry of type II Cepheid candidates from the northern part of the
All Sky Automated Survey.
Schmidt E.G., Hemen B., Rogalla D., Thacker-Lynn L.
<Astron. J., 137, 4598-4607 (2009)>
=2009AJ....137.4598S 2009AJ....137.4598S
ADC_Keywords: Stars, variable ; Photometry
Keywords: Cepheids; stars: Population II
Abstract:
We have obtained VR photometry of 282 Cepheid variable star candidates
from the northern part of the All Sky Automated Survey (ASAS). These
together with data from the ASAS and the Northern Sky Variability
Survey (NSVS) were used to redetermine the periods of the stars.
Description:
We made about 6600 RV observations of the Cepheid candidates between
2005 August and 2008 July (JD 2453597 and 2454661) at Behlen
Observatory.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 29 282 Program stars
table3.dat 85 282 Light curve parameters
table2.dat 29 6594 Photometric data
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See also:
II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Name Running object name (ANNN)
6- 18 A13 --- ASAS ASAS star designation
20- 22 I3 --- N1 Number of NSVS observations
24- 26 I3 --- N2 Number of ASAS observations
28- 29 I2 --- N3 Number of Behlen observatory observations
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Name Running object name (ANNN)
6- 14 F9.6 d Per ? Period from present study
17- 23 F7.6 d e_Per ? Uncertainty in on Per
26- 30 F5.2 mag <Vmag> Mean V magnitude
32- 35 F4.2 mag e_<Vmag> ? Uncertainty in <Vmag>
37- 40 F4.2 mag <V-R> Mean V-R color index
42- 45 F4.2 mag e_<V-R> ? Uncertainty in <V-R>
47- 51 F5.3 mag Vamp V amplitude
53- 57 F5.3 mag scat ? Scatter of points about fitted light curve
59- 63 F5.2 --- Slope ? Slope of V:V-R Relation
65- 68 F4.2 --- e_Slope ? Uncertainty in Slope
70- 81 A12 --- Notes Notes on Status of Star (1)
83- 85 A3 --- Group Group number to which star belongs (2)
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Note (1): Following Paper I, Cepheid candidates were removed on the
basis of inappropriate light curve form, negative slope of the
color-magnitude trajectory, or short period (flags CO, EC, IR, SL,
SP). Lowercase letters refer to the footnotes. Footnote "f" indicates
that comments regarding individual stars can be found in the Appendix.
Footnotes "c", "d", "e", "g", "h", "i", and "j" identify instabilities
in the photometric behavior. Given the amount of data we have, it is
sometimes difficult to distinguish changes in light curve shape from
phase jitter so footnote "g" includes both possibilities.
Note (2): the 4 groups are defined in the (Period,<V-R>) diagram
(see section 3 of the paper)
* group (1) includes the majority of the classical Cepheids
* group (2) includes most of the type II Cepheids (P<2.2d)
* group (3) includes red variables with long periods
(could be reddened Cepheids)
* group (4) includes variables with periods appropriate with type II
Cepheids, but colors are much redder.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Name Object name (ANNN)
6- 16 F11.3 d HJD Heliocentric Julian date
18- 23 F6.3 mag Vmag The V band magnitude
25- 29 F5.3 mag V-R The (V-R) color index
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History:
From electronic version of the journal
References:
Schmidt et al., Paper I, 2007AJ....133..665S 2007AJ....133..665S, Cat. J/AJ/133/665
Schmidt et al., Paper III, 2011AJ....141...53S 2011AJ....141...53S, Cat. J/AJ/141/53
Schmidt et al., Paper IV, 2013AJ....146...61S 2013AJ....146...61S, Cat. J/AJ/146/61
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 04-Nov-2011