J/AJ/153/218 New IR photometric study of Ap and Am stars (Chen+, 2017)
A new photometric study of Ap and Am stars in the infrared.
Chen P.S., Liu J.Y., Shan H.G.
<Astron. J., 153, 218-218 (2017)>
=2017AJ....153..218C 2017AJ....153..218C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, Ap ; Stars, Am ; Photometry, infrared ; Spectral types ;
Extinction
Keywords: infrared: stars - stars: peculiar
Abstract:
In this paper, 426 well known confirmed Ap and Am stars are
photometrically studied in the infrared. The 2MASS, Wide-field
Infrared Survey Explorer (WISE), and IRAS data are employed to make
analyses. The results in this paper have shown that in the 1-3 µm
region over 90% Ap and Am stars have no or little infrared excesses,
and infrared radiations in the near-infrared from these stars are
probably dominated by the free-free emissions. It is also shown that
in the 3-12 µm region, the majority of Ap stars and Am stars have
very similar behavior, i.e., in the W1-W2 (3.4-4.6 µm) region, over
half of Ap and Am stars have clear infrared excesses, which are
possibly due to the binarity, the multiplicity, and/or the debris disk,
but in the W2-W3 (4.6-12 µm) region they have no or little infrared
excess. In addition, in the 12-22 µm region, some of Ap stars and
Am stars show the infrared excesses and infrared radiations for these
Ap and Am stars are probably due to the free-free emissions. In
addition, it is seen that the probability of being the binarity, the
multiplicity and/or the debris disk for Am stars is much higher than
that for Ap stars. Furthermore, it can be seen that, in general, no
relations can be found between infrared colors and spectral types
either for Ap stars or for Am stars.
Description:
In the General Catalog of Ap and Am stars (Renson & Manfroid
2009, Cat. III/260) 8265 stars are included in which, as Renson & Manfroid
(2009, Cat. III/260) described, only 426 stars are of the "well known
confirmed sample". We take these 426 stars as our working sample.
The cross-identifications of 2MASS/WISE counterparts for all Ap, Am,
and HgMn stars listed in this paper are made from Cutri et al. (2012,
Cat. II/311) by using the radius of 2 arcsec. All 426 Ap, Am, and HgMn
stars have 2MASS and/or WISE counterparts, which are listed in Table 3.
The cross-identifications of IRAS counterparts are made according to
the positional error ellipse of the source, because it has a 95%
confidence level (IRAS Explanatory Supplement, Beichman et al.
1988, Cat. II/274). Finally, 202 stars are found to have the IRAS
counterparts from IRAS PSC/FSC, which is listed in Table 4.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 158 426 Infrared Properties of Ap, Am, and HgMn Stars
in This Paper
table4.dat 48 202 IRAS Observations of Ap, Am, and HgMn Stars
in This Paper
table5.dat 83 144 Ap and Am Stars with (W1-W2)o>0.1 in This Paper
table6.dat 81 36 Ap and Am Stars with (J-H)o>0.1 in This Paper
table7.dat 86 37 Ap and Am stars with (W3-W4)o>0.3 in This Paper
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See also:
II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)
II/274 : IRAS Point Source Reject Catalog (IRAS 1989)
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2014)
I/274 : CCDM (Catalog of Components of Double Multiple stars)
(Dommanget+ 2002)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
B/sb9 : SB9: 9th Catalogue of Spectroscopic Binary Orbits
(Pourbaix+ 2004-2014)
I/280 : All-Sky Compiled Catalogue of 2.5 million stars (Kharchenko+ 2009)
III/260 : General Catalogue of Ap and Am stars (Renson+ 2009)
B/mk : Catalogue of Stellar Spectral Classifications (Skiff, 2009-2016)
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
J/A+A/394/151 : Multiplicity among chemically peculiar stars II
(Carrier+, 2002)
J/MNRAS/389/869 : Multiplicity among bright stellar systems (Eggleton+, 2008)
J/MNRAS/427/343 : Infrared excesses of Hipparcos stars (McDonald+, 2012)
J/MNRAS/437/1216 : VAST Survey. A-type stars multiplicity (De Rosa+, 2014)
J/MNRAS/460/1912 : The Catalog of HgMn Stars (Ghazaryan+, 2016)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Num [1/426] Star number in this paper
5- 8 I4 --- RNum [7/8205] Star number from the General Catalog
of Ap and Am stars (Renson & Manfroid, 2009,
Cat. III/260, Renson NNNN in Simbad)
10- 20 A11 --- Name Star name (HD or others)
22- 23 I2 h RAh Hour of Right Ascension (J2000) (1)
25- 26 I2 min RAm Minute of Right Ascension (J2000) (1)
28- 32 F5.2 s RAs Second of Right Ascension (J2000) (1)
34 A1 --- DE- Sign of the Declination (J2000) (1)
35- 36 I2 deg DEd Degree of Declination (J2000) (1)
38- 39 I2 arcmin DEm Arcminute of Declination (J2000) (1)
41- 44 F4.1 arcsec DEs Arcsecond of Declination (J2000) (1)
46- 58 A13 --- SpType Spectral type (2)
60- 63 A4 --- CPType [m p HgMn] Chemical Peculiar star type (2)
65- 69 F5.3 mag Av [0/1.488]? Galactic extinction coefficient
71- 75 F5.3 mag Jmag [1.713/9.944] 2MASS J band magnitude
77- 81 F5.3 mag e_Jmag [0.017/6.841] Uncertainty in Jmag
83- 87 F5.3 mag Hmag [1.697/9.986] 2MASS H band magnitude
89- 93 F5.3 mag e_Hmag [0.014/7.73] Uncertainty in Hmag
95-100 F6.3 mag Ksmag [0.023/10.022] 2MASS Ks band magnitude
102-106 F5.3 mag e_Ksmag [0.013/7.716] Uncertainty in Ksmag
108-113 F6.3 mag W1mag [0.023/10.003]? WISE W1 (3.4µm) band
magnitude
115-119 F5.3 mag e_W1mag [0.021/7.749]? Uncertainty in W1mag
121-126 F6.3 mag W2mag [0.02/10.062]? WISE W2 (4.6µm) band
magnitude
128-132 F5.3 mag e_W2mag [0.004/7.686]? Uncertainty in W2mag
134-139 F6.3 mag W3mag [0.014/10.091]? WISE W3 (12µm) band
magnitude
141-145 F5.3 mag e_W3mag [0.006/7.13]? Uncertainty in W3mag
147 A1 --- l_W4mag [<] Limit flag on W4mag
148-152 F5.3 mag W4mag [0.025/9.43]? WISE W4 (22µm) band magnitude
154-158 F5.3 mag e_W4mag [0.008/0.476]? Uncertainty in W4mag
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Note (1): The star position in the epoch of 2000 from the General Catalog
of Ap and Am stars (Renson & Manfroid 2009, Cat. III/260).
Note (2): From Skiff (2009-2016, Cat. B/mk), All-Sky Compiled Catalog of
2.5 million stars (ASCC) Kharchenko & Roeser (2009, Cat. I/280B) or
Renson & Manfroid (2009, Cat. III/260).
Chemical Peculiar star type as follows:
m = Am stars (the metallic line star) with the high binary frequency and
without strong magnetic field;
p = Ap stars with strong magnetic field and the low binary frequency;
HgMn = Most of these stars have no magnetic field.
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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- 3 I3 --- Num [4/424] Star number in this paper
5- 15 A11 --- IRAS IRAS PSC/FSC name
17- 24 E8.3 Jy F12 [0.0735/8.89] IRAS flux at 12µm
26 I1 --- q_F12 [1/3] Quality flag on F12 (1)
28- 35 E8.3 Jy F25 [0.0466/9.07] IRAS flux at 25µm
37 I1 --- q_F25 [1/3] Quality flag on F25 (1)
39- 46 E8.3 Jy F60 [0.0848/32.3] IRAS flux at 60µm
48 I1 --- q_F60 [1/3] Quality flag on F60 (1)
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Note (1): "q" shows the data quality, if q=1 means the upper limit value.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- Type Star type (Ap or Am)
4- 6 I3 --- Num [12/424] Star number in this paper
7 A1 --- n_Num [x] Note on Num (G1)
9- 14 I6 --- HD [3883/223461] HD number
16- 27 A12 --- SpType Spectral classification
29- 33 F5.3 mag W1mag [2.108/6.242] WISE W1 (3.4µm) band
magnitude (G2)
35- 39 F5.3 mag W2mag [1.559/6.105] WISE W2 (4.6µm) band
magnitude (G2)
41- 45 F5.3 mag W3mag [1.661/6.165] WISE W3 (12µm) band
magnitude (G2)
47- 51 F5.3 mag Av [0/1.057] Galactic extinction coefficient (G2)
53- 57 F5.3 mag (W1-W2)o [0.1/1.283] The derived (W1-W2)o color index
(G5)
59- 62 F4.1 um lpeak [2.1/12.1]? Wavelength with the peak infrared
excess λpeak (G3)
64- 68 F5.3 um E(2-60um) [0/4.267]? Average infrared excess within
2-60µm (G3)
70- 83 A14 --- Ref Reference(s) (G4)
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- Type Star type (Ap or Am)
4- 6 I3 --- Num [36/422] Star number in this paper
7 A1 --- n_Num [*] Note on Num (G1)
9- 14 I6 --- HD [12446/221760] HD number
16- 27 A12 --- SpType Spectral classification
29- 33 F5.3 mag Jmag [2.253/8.76] 2MASS J band magnitude (G2)
35- 39 F5.3 mag Hmag [2.062/8.562] 2MASS H band magnitude (G2)
41- 45 F5.3 mag Ksmag [2.013/8.543] 2MASS Ks band magnitude (G2)
47- 51 F5.3 mag Av [0/1.032] Galactic extinction coefficient (G2)
53- 57 F5.3 mag (J-H)o [0.101/0.487] The derived (J-H)o color index
(G5)
59- 62 F4.1 um lpeak [2.1/12]? Wavelength with the peak infrared
excess λpeak (G3)
64- 68 F5.3 um E(2-60um) [0.853/1.985]? Average infrared excess within
2-60µm (G3)
70- 81 A12 --- Ref Reference(s) (G4)
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Byte-by-byte Description of file: table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- Type Star type (Ap or Am)
4- 6 I3 --- Num [6/416] Star number in this paper
7 A1 --- n_Num [*+] Note on Num (G1)
9- 19 A11 --- Name Star name (HD or other)
21- 33 A13 --- SpType Spectral classification
35- 39 F5.3 mag W2mag [3.088/9.15] WISE W2 (4.6µm) band magnitude
(G2)
41- 45 F5.3 mag W3mag [3.773/9] WISE W3 (12µm) band magnitude
(G2)
47- 51 F5.3 mag W4mag [2.485/8.149] WISE W4 (22µm) band magnitude
(G2)
53- 57 F5.3 mag Av [0/0.936] Galactic extinction coefficient (G2)
59- 63 F5.3 mag (W3-W4)o [0.227/4.063] The derived (W3-W4)o color index
(G5)
65- 68 F4.1 um lpeak [4.6/22]? Wavelength with the peak infrared
excess λpeak (G3)
70- 74 F5.3 um E(2-60um) [1.037/2.024]? Average infrared excess within
2-60µm (G3)
76- 86 A11 --- Ref Reference(s) (G4)
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Global notes:
Note (G1): Note as follows:
x = The source is listed in tables 6 and 7;
* = The source is listed in table 5;
+ = The source is listed in table 6.
Note (G2): Data from table 3.
Note (G3): From the Infrared excesses in Hipparcos stars by McDonald et al.
(2012, J/MNRAS/427/343).
Note (G4): Reference for the binary/multiplicity/debris disk as follows:
1 = Eggleton & Tokovinin (2008, J/MNRAS/389/869): multiplicity;
2 = Mason et al. (2001-2014, Cat. B/wds): double and multiple;
3 = Dommanget & Nys (2002, Cat. I/274): double and multiple;
4 = Pourbaix et al. (2004-2014, Cat. B/sb9): spectroscopic binary;
5 = De Rosa et al. (2014, J/MNRAS/437/1216): multiplicity;
6 = ESA (1997, Cat. I/239): double and multiple;
7 = Trilling et al. (2007ApJ...658.1289T 2007ApJ...658.1289T): debris disk;
8 = Marion et al. (2014A&A...570A.127M 2014A&A...570A.127M): binary;
9 = Scholler et al. (2010A&A...522A..85S 2010A&A...522A..85S): binary and multiplicity;
10 = Ducati et al. (2011A&A...525A..26D 2011A&A...525A..26D): spectroscopic binary.
Note (G5): After the Galactic extinction correction.
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(End) Tiphaine Pouvreau [CDS] 24-May-2018