J/AJ/146/61 Type II Cepheid candidates. IV. Objects from NSVS (Schmidt+, 2013)
Type II Cepheid candidates.
IV. Objects from the Northern Sky Variability Survey.
Schmidt E.G.
<Astron. J., 146, 61 (2013)>
=2013AJ....146...61S 2013AJ....146...61S
ADC_Keywords: Stars, variable ; Spectroscopy ; Photometry
Keywords: stars: Population II - stars: variables: Cepheids
Abstract:
We have obtained VR photometry of 447 Cepheid variable star candidates
with declinations north of -14°30', most of which were identified
using the Northern Sky Variability Survey (NSVS) data archive. Periods
and other photometric properties were derived from the combination of
our data with the NSVS data. Atmospheric parameters were determined
for 81 of these stars from low-resolution spectra. The identification
of type II Cepheids based on the data presented in all four papers in
this series is discussed. On the basis of spectra, 30 type II Cepheids
were identified while 53 variables were identified as cool, main
sequence stars and 283 as red giants following the definitions in
Paper III. An additional 30 type II Cepheids were identified on the
basis of light curves. The present classifications are compared with
those from the Machine-learned All Sky Automated Survey Classification
Catalog for 174 stars in common.
Description:
We made more than 6700 RV observations of the program stars between
2007 January 18 and 2012 May 14 (JD2454119-2456062) at Behlen
Observatory (Table2).
Spectra for 81 of the present program stars, two stars (A273 and A277)
from PaperII (Schmidt et al., 2009, cat. J/AJ/137/4598) that were not
included in PaperIII (Schmidt et al., 2011, cat. J/AJ/141/53), and 23
standard stars were obtained with the GoldCam spectrograph on the Kitt
Peak National Observatory 2.1m telescope during five nights in 2010
August (Table3).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 67 449 The program stars and photometric parameters
from the NSVS photometry
table2.dat 26 6744 Photometric data
table3.dat 196 164 Lick/IDS indices on the MILES system
table4.dat 34 164 The atmospheric parameters from individual spectra
table5.dat 88 449 Light curve parameters from the Behlen photometry
and atmospheric parameters from spectra
table7.dat 20 60 New type II Cepheids
table9.dat 25 45 Known Cepheids
table11.dat 818 126 Notes on individual stars
notes.dat 398 22 Notes
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See also:
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
J/AJ/141/53 : Lick indices of type II Cepheid candidates (Schmidt+, 2011)
J/AJ/139/2026 : TAOS variable stars (Mondal+, 2010)
J/AJ/138/466 : NSVS variables automated classification (Hoffman+, 2009)
J/AJ/137/4598 : VR light curve of ASAS-North Cepheids (Schmidt+, 2009)
J/AJ/133/665 : Photometry of type II Cepheid candidates (Schmidt+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Star Running star identifier (G1)
6- 24 A19 --- Name Star designation (JHHMMSS.ss+DDMMSS.s)
26- 37 A12 --- OName Other name (1)
39- 43 F5.2 mag [8.75/15.82]? Mean magnitude from NSVS
45- 48 F4.2 mag Amp ? Amplitude of NSVS magnitudes (Δm)
50- 53 F4.2 mag s_ ? RMS scatter of NSVS magnitudes about mean
light curve (σm)
55- 57 I3 --- NN [23/779]? Number of observations from the NSVS
59- 67 A9 --- Note1 Notes about NSVS observations; in notes.dat file
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Note (1): From the General Catalogue of Variable Stars (GCVS; cat. B/gcvs),
Hoffman et al. (2009, cat. J/AJ/138/466), or Wils & Greaves
(2004IBVS.5512....1W 2004IBVS.5512....1W) for stars listed in those sources.
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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 --- Star Running star identifier (G1)
6- 13 F8.3 d HJD [4119/6063] Heliocentric Julian Date; HJD-2450000
15- 20 F6.3 mag Vmag The V band magnitude
22- 26 F5.3 mag V-R The (V-R) color index
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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 --- Star Running star identifier (G1)
6- 12 A7 --- Std Name of standard star (1)
14- 20 F7.2 d HJD [5419/5424] Heliocentric Julian Date of
mid-exposure; HJD-2450000
22- 26 F5.3 mag CN1 Lick/IDS CN1 index
28- 32 F5.3 mag CN2 Lick/IDS CN2 index
34- 39 F6.3 0.1nm Ca4227 Lick/IDS Ca4227 index
41- 46 F6.3 0.1nm G4300 Lick/IDS G4300 index
48- 54 F7.3 0.1nm Fe4383 Lick/IDS Fe4383 index
56- 61 F6.3 0.1nm Ca4455 Lick/IDS Ca4455 index
63- 67 F5.3 0.1nm Fe4531 Lick/IDS Fe4531 index
69- 74 F6.3 0.1nm Fe4668 Lick/IDS Fe4668 index
76- 82 F7.3 0.1nm Hb Lick/IDS Hβ index
84- 89 F6.3 0.1nm Fe5015 Lick/IDS Fe5015 index
91- 95 F5.3 mag Mg1 Lick/IDS Mg1 index
97-101 F5.3 mag Mg2 Lick/IDS Mg2 index
103-109 F7.3 0.1nm Mgb Lick/IDS Mgb index
111-115 F5.3 0.1nm Fe5270 Lick/IDS Fe5270 index
117-121 F5.3 0.1nm Fe5335 Lick/IDS Fe5335 index
123-127 F5.3 0.1nm Fe5406 Lick/IDS Fe5406 index
129-133 F5.3 0.1nm Fe5709 Lick/IDS Fe5709 index
135-139 F5.3 0.1nm Fe5782 Lick/IDS Fe5782 index
141-145 F5.3 0.1nm NaD Lick/IDS Na D index
147-151 F5.3 mag TiO1 Lick/IDS TiO1 index
153-157 F5.3 mag TiO2 Lick/IDS TiO2 index
159-165 F7.3 0.1nm HdA Lick/IDS HδA index
167-173 F7.3 0.1nm HgA Lick/IDS HγA index
175-181 F7.3 0.1nm HdF Lick/IDS HδF index
183-188 F6.3 0.1nm HgF Lick/IDS HγF index
190-196 F7.3 0.1nm Ha Lick/IDS Hα index
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Note (1): The 23 standard stars were used to derive transformations between our
indices and the MILES system and our indices were all transformed to that
system.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Star ? Running star identifier (G1)
6- 12 F7.2 d HJD [5419/5424]? Heliocentric Julian Date of
mid-exposure; HJD-2450000
14- 18 I5 K Teff ? Effective temperature (uncorrected for phase)
20- 23 F4.2 [cm/s2] logg ? Log of surface gravity
25- 29 F5.2 [Sun] [Fe/H] [-2.0/0.3]? Metallicity
31- 34 F4.2 mag E(V-R) ? Color excess in (V-R)
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Star Running star identifier (G1)
6- 16 F11.7 d Per ? Period from present study
18- 26 F9.7 d e_Per ? Period uncertainty
28- 32 F5.2 mag <Vmag> ? Mean V magnitude
34- 38 F5.2 mag <V-R> ? Mean V-R color index
40- 43 F4.2 mag Vamp ? V amplitude (ΔV)
45- 49 F5.3 mag s_<Vmag> ? Scatter of points about fitted light curve
(ΔV)
51- 53 I3 --- NB [3/48] Number of Behlen observations
55- 59 I5 K <Teff> ? Mean effective temperature
61- 64 F4.2 [cm/s2] ? Mean logarithm of gravity
66- 70 F5.2 [Sun] [Fe/H] [-1.8/0.3]? Metallicity
72- 76 F5.2 mag E(V-R) ? Color excess in (V-R)
78- 88 A11 --- Note2 Note about Behlen observations, in notes.dat
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- n_Star Classification of the star (1)
5- 8 A4 --- Star Running star identifier (G1)
10- 12 A3 --- f_Star Flag on Star (2)
14- 18 F5.2 d Per Period
20 A1 --- MType Morphological type of the light curve (G2)
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Note (1): Class defined as follows:
S = stars classified on the basis of the Spectrum;
LC = stars classified on the basis of Light Curve morphology;
C/A = stars classified on the basis of Color and/or Amplitude.
Note (2): Flag defined as follows:
a = This star is V716 Oph, classed as CWB in the General Catalogue of Variable
Stars (GCVS; cat. B/gcvs);
b = This star is LX And, classed as RVB in the GCVS. Due to irregular behavior
no period is given in Table5. A typical time scale is used here;
c = This star is V480 Lyr, classed as EB: in the GCVS;
d = This star is V360 Cyg, classed as RVA in the GCVS;
e = This star also qualified as a Cepheid on the basis of its color and/or
amplitude;
f = This star was considered a non-variable in the Behlen photometry,
indicating a large decline in amplitude since the Northern Sky Variability
Survey (NSVS; available at http://skydot.lanl.gov/) photometry. It is
included here on the basis of its color;
g = Due to small gaps in the phase coverage for this star, the duration of
maximum is uncertain and could exceed 0.3. However, it is included here
since the amplitude indicates a Cepheid.
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- n_Name Classification of the Cepheid (1)
9- 17 A9 --- Name Name of the Cepheid
19- 23 F5.2 d Per Period
25 A1 --- MType Morphological type of the light curve (G2)
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Note (1): Class defined as follows:
II+Spec = known type II Cepheid with Spectra;
I+Spec = known type I Cepheid with Spectra;
II-Spec = known type II Cepheid without Spectra.
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Byte-by-byte Description of file: table11.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Star Star name (G1)
6-818 A813 --- Text Text of note
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1 A1 --- ID Note identifier
3-398 A396 --- Text Text of note
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Global notes:
Note (G1): The prefixes (A, B, H, T, or W) indicate the reference:
A = Schmidt et al. (2009, cat. J/AJ/137/4598);
B = NSVS database (Wozniak et al., 2004AJ....127.2436W 2004AJ....127.2436W; available online at
http://skydot.lanl.gov/);
H = Hoffman et al. (2009, cat. J/AJ/138/466);
T = Mondal et al. (2010, cat. J/AJ/139/2026);
W = Wils & Greaves (2004IBVS.5512....1W 2004IBVS.5512....1W).
Note (G2): Our light curve morphology (see Section 5.2.1 for details) is
summarized as follows:
A = Light curve with flat maxima and rather narrow, symmetric minima;
B = Crested light curve;
C = Light curve with a bump prior to maximum;
D = Light curve of both type I and type II Cepheid (commonly exhibit a rapid
rise and slow decline);
S = Light curve that do not differ at a statistically level from sinusoid;
O = Light curve that could not be placed in any of the previous categories.
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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 II, 2009AJ....137.4598S 2009AJ....137.4598S, Cat. J/AJ/137/4598
Schmidt et al., Paper III, 2011AJ....141...53S 2011AJ....141...53S, Cat. J/AJ/141/53
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 03-Jul-2014