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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 (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:
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
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
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
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.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
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)
Note (1): "q" shows the data quality, if q=1 means the upper limit value.
Byte-by-byte Description of file: table5.dat
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)
Byte-by-byte Description of file: table6.dat
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)
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)
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): debris disk; 8 = Marion et al. (2014A&A...570A.127M): binary; 9 = Scholler et al. (2010A&A...522A..85S): binary and multiplicity; 10 = Ducati et al. (2011A&A...525A..26D): spectroscopic binary. Note (G5): After the Galactic extinction correction.
History: From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 24-May-2018
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