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J/AJ/154/81   BVRI photometry of luminous stars in M31 and M33   (Martin+, 2017)

Multi-epoch BVRI photometry of luminous stars in M31 and M33. Martin J.C., Humphreys R.M. <Astron. J., 154, 81-81 (2017)> =2017AJ....154...81M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Stars, nearby ; Stars, luminous ; Stars, supergiant ; Photometry, UBVRI ; Stars, variable Keywords: galaxies: individual (M31,M33) - stars: massive - supergiants Abstract: We present the first four years of BVRI photometry from an on-going survey to annually monitor the photometric behavior of evolved luminous stars in M31 and M33. Photometry was measured for 199 stars at multiple epochs, including 9 classic Luminous Blue Variables (LBVs), 22 LBV candidates, 10 post-RGB A/F type hypergiants, and 18 B[e] supergiants. At all epochs, the brightness is measured in the V-band and at least one other band to a precision of 0.04-0.10 mag down to a limiting magnitude of 19.0-19.5. Thirty three stars in our survey exhibit significant variability, including at least two classic LBVs caught in S Doradus-type outbursts. A hyperlinked version of the photometry catalog is at Description: Images were obtained of M31 and M33 using an Apogee U42 CCD Camera with a back-illuminated E2v CCD42-40 chip on the F/13 20-inch (0.51m) telescope at the University of Illinois Springfield Henry R. Barber Research Observatory near Pleasant Plains, IL. The images are 19.4*19.4 arc minutes squares with a pixel scale of 0.57 arcseconds per pixel. Images were exposed in four high-throughput broad-band filters manufactured by Astrodon: Johnson B and V, and Cousins R and I. The B-filter does not have the red-leak present in most Astrodon B-filers manufactured prior to 2013. Images were taken in V at every epoch except one in 2012. In 2012, many fields were also imaged in R. Imaging in the B-filter started in 2013, and imaging in the I-filter started in 2015. Table 1 gives a record of the 199 images of M31 and 77 images of M33. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 68 274 Image log table3.dat 67 253 Photometric comparison stars table4.dat 116 1697 Target photometry table5.dat 438 200 Target notes table6.dat 110 32 Possible variables
See also: II/336 : AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016) J/ApJ/836/64 : Luminous variable stars in M31 + M33. IV. (Humphreys+, 2017) J/ApJ/825/50 : Variable stars in M31 & M33. III. (Gordon+, 2016) J/AJ/152/62 : Revised LGGS UBVRI of M31 and M33 stars (Massey+, 2016) J/ApJ/790/48 : Variable stars in M31 & M33. II. LBVs (Humphreys+, 2014) J/MNRAS/371/1405 : Variables in M33 (Hartman+, 2006) J/A+A/445/423 : WeCAPP Survey. M31 variables (Fliri+, 2006) J/AJ/131/2478 : M31 and M33 UBVRI photometry (Massey+, 2006) J/AJ/115/1894 : EBs and Cepheids in M31A field (Stanek+ 1998) J/AJ/115/1016 : M 31B eclipsing binaries and Cepheids (Kaluzny+ 1998) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 A3 --- Gal Galaxy targeted (M31 or M33) 5- 14 A10 "Y:M:D" Date UT date of exposure start 16- 24 F9.3 d MJD Modified Julian Date at exposure start 26- 28 F3.1 arcsec Seeing [2.6/6.5] Full Width at Half Maximum (FWHM) of Point-Spread-Function (PSF) (approximate seeing) 30 A1 --- Flt [BVRI] Johnson-Cousins filter (B, V, R, or I) 32- 33 I2 h RAh Hour of Right Ascension (J2000) (1) 35- 36 I2 min RAm Minute of Right Ascension (J2000) (1) 38- 42 F5.2 s RAs Second of Right Ascension (J2000) (1) 44 A1 --- DE- Sign of the Declination (J2000) (1) 46- 47 I2 deg DEd Degree of Declination (J2000) (1) 49- 50 I2 arcmin DEm Arcminute of Declination (J2000) (1) 52- 55 F4.1 arcsec DEs Arcsecond of Declination (J2000) (1) 57- 61 F5.1 deg Rot [150.8/184.6] Field rotation (2) 63- 66 F4.1 mag Faint [17/19.6] Estimate of faint limit (3) 68 A1 --- f_Faint [d] Flag on Faint for 2017 May images (4)
Note (1): Image center. Note (2): Orientation of ascending row axis measured east of north in degrees. The rotation of the images changed year to year as a result of wear on the adapter holding the camera to the telescope. Note (3): A rough completeness limit estimated from peak of the magnitude frequency distribution for the image. It may be possible to measure some stars as much as 0.5-1.0mag fainter on the image. Note (4): Images taken on MJD 57887.404, 57888.390, and 57888.406 were taken under twilight conditions with a bright sky.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 7 F7.4 deg RAdeg Right Ascension in decimal degrees (J2000) 9- 15 F7.4 deg DEdeg Declination in decimal degrees (J2000) 17- 22 F6.3 mag Vmag [10.59/17.1] The V-band magnitude 24- 28 F5.3 mag e_Vmag [0/0.17] The 1σ error in Vmag 30- 34 F5.3 mag B-V [0.06/1.47]? The (B-V) color index 36- 40 F5.3 mag e_B-V [0.014/0.206]? The 1σ error in B-V 42- 43 A2 --- f_B-V [NA] NA flag on (B-V) color index and error 45- 49 F5.3 mag V-R [0.056/1.11]? The (V-R) color index 51- 55 F5.3 mag e_V-R [0/0.47]? The 1σ error in V-R 57- 61 F5.3 mag V-I [0.11/2.13]? The (V-I) color index 63- 67 F5.3 mag e_V-I [0/0.67]? The 1σ error in V-I
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 20 A20 --- LGGS Star designation ( format) in the Local Group Galaxy Survey (LGGS) 22- 41 A20 --- Name Name in catalog 43- 50 F8.2 d MJD Modified Julian Date 52 A1 --- l_Vmag [>] Lower limit flag on Vmag 54- 58 F5.2 mag Vmag [13.81/20.41]? Johnson V-band magnitude 60- 63 F4.2 mag e_Vmag ? The 1σ error in Vmag 65- 67 A3 --- n_Vmag Notes for Vmag (1) 69 A1 --- l_Bmag [>] Lower limit flag on Bmag 71- 75 F5.2 mag Bmag [14.32/20.95]? Johnson B-band magnitude 77- 80 F4.2 mag e_Bmag [0.01/0.41]? The 1σ error in Bmag 82- 84 A3 --- n_Bmag Notes for Bmag (1) 86 A1 --- l_Rmag [>] Lower limit flag on Rmag 88- 92 F5.2 mag Rmag [13.35/20.1]? Cousins R-band magnitude 94- 97 F4.2 mag e_Rmag [0.01/0.41]? The 1σ error in Rmag 99-100 A2 --- n_Rmag Notes for Rmag (1) 102 A1 --- l_Imag [>] Lower limit flag on Imag 104-108 F5.2 mag Imag [12.87/19.71]? Cousins I band magnitude 110-113 F4.2 mag e_Imag [0.03/0.28]? The 1σ error in Imag 115-116 A2 --- n_Imag Notes for Imag (1)
Note (1): Flags after each magnitude note the following: T = Magnitude not transformed because no valid color at that epoch; A = Two measurements averaged into the reported value (see Section 2.3 in the paper); b = Blending may impact the reported magnitude by less than the reported error; B = Blending may impact the reported magnitude by more than the reported error but there is a good chance that the measurement may still be reliable; X = Poor image quality renders this measurement unreliable.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 20 A20 --- LGGS Star designation ( format) in the Local Group Galaxy Survey (LGGS) 22- 41 A20 - Name Name in catalog 43-438 A396 - Note Notes
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 22 A22 --- Class Spectral class (B[e]sg=B[e] supergiant, LBV=Luminous Blue Variable) 24- 43 A20 --- LGGS Star designation ( format) in the Local Group Galaxy Survey (LGGS) 45- 57 A13 --- Name Name in catalog 59- 63 F5.2 mag <Vmag> [15.74/19.35] Average V band magnitude 65- 75 A11 --- Var Variability? (likely, or very likely) 77- 80 F4.2 mag VRange [0.08/0.82] V band magnitude range 82- 85 F4.2 --- R2BV [0.42/1] R2 correlation in the BV band pair 87- 90 F4.2 --- e_R2BV [0.04/0.1] Error in R2BV 92- 95 F4.2 --- R2VR [0.63/1] R2 correlation in the VR band pair 97-100 F4.2 --- e_R2VR [0.04/0.11] Error in R2VR 102-105 F4.2 --- R2BR [0.35/0.97]? R2 correlation in the BR band pair 107-110 F4.2 --- e_R2BR [0.04/0.09]? Error in R2BR
History: From electronic version of the journal
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 09-Nov-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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