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J/A+AS/119/499 NGC 628 and companions photometric distances (Sharina+ 1996)
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Photometric distances to NGC 628 and its four companions
Sharina M.E., Karachentsev I.D., Tikhonov N.A.
<Astron. Astrophys. Suppl. Ser. 119, 499 (1996)>
=1996A&AS..119..499S (SIMBAD/NED BibCode)
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ADC_Keywords: Galaxies, photometry ; Redshifts
Keywords: galaxies: NGC 628; distances and redshifts; irregular
Description:
Based on photometry of the brightest blue stars we derived distance
moduli for NGC 628 and its dwarf irregular companions: DDO 13, UGC
1171, UGC 1104, and K 10. The mean modulus of the group is estimated
to be 29.46 mag with a formal (internal) error of 0.11. The total mass
to luminosity ratio of 40M_{sun}_/L_{sun}_ seems sufficient for NGC
628 to keep its companions in bound orbits.
Objects:
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RA (2000) DE Designation(s)
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01 36.7 +15 47 NGC 628
01 40.15 +15 56 DDO 13
01 39.7 +15 54 UGC 1171
01 32.7 +18 19 UGC 1104
01 43.3 +19 59 UGCA 20
01 43.0 +13 38 NGC 660
01 43.7 +15 40 K68 10
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 38 98 CCD photometry of the brightest stars in NGC628
table2 20 8 Photometry of stars in NGC628
table3 20 6 Photometry of stars in DDO 13
table4 20 5 Photometry of stars in UGC 1171
table5 27 7 Photometry of stars in UGC 1104
table6 27 3 Photometry of stars in K68 10
table7 27 3 Brightest stars in UGCA 20
table8 59 9 Properties of the galaxies around NGC 628
table9 50 8 NGC 628 and NGC 660 with their companions
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 6 A6 --- Numb. Star number
9- 11 I3 pix Xpos Rectangular coordinates of stars
15- 17 I3 pix Ypos Rectangular coordinates of stars
22- 26 F5.2 mag Vmag V magnitude
31- 35 F5.2 mag B-V (B-V) colour index
38- 42 A5 --- Notes By the letter "D" we indicate the cases
when an object image appears diffuse.
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Byte-by-byte Description of file: table2 table3 table4 table5 table6 table7
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Bytes Format Units Label Explanations
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1- 5 A5 --- Star Star number
7- 11 F5.2 mag Bmag B magnitude
12 A1 --- u_Bmag Uncertainty flag on B
16- 20 F5.2 mag Vmag V magnitude
23- 27 F5.2 mag Rmag ? R magnitude
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Byte-by-byte Description of file: table8
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Bytes Format Units Label Explanations
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1- 7 A7 --- Galaxy Galaxy name
10- 11 I2 --- MType Morphological type
13- 17 F5.1 arcmin a Standard angular diameter
19- 23 F5.2 --- b/a Apparent axis ratio
26- 30 F5.2 mag Bt Total blue magnitude
32- 36 F5.2 mag (B-V)0 ? Colour corrected for galactic extinction
39- 41 I3 km/s RVm Measured radial velocity
44- 46 I3 km/s W50 ? HI line width measured at 50% level of
maximum
49- 52 I4 km/s RVc Radial velocity corrected for the Sun motion
with respect to the Local Group centroid
55- 59 F5.2 Mpc Dist ? Measured distance
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Byte-by-byte Description of file: table9
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Bytes Format Units Label Explanations
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1- 7 A7 --- Galaxy Galaxy name
9- 13 F5.1 kpc A25 Standard linear diameter
15- 19 F5.1 Sun (M/L)k Mass to luminosity ratio
22- 26 F5.2 10+10solMass Mk Mass of the galaxy
29- 32 F4.0 km/s V1-Vk Velocity of the main galaxy minus velocity
of its companion
35- 38 F4.0 kpc R1k Projection of the linear separation
between the galaxies
40- 44 F5.2 --- g1k Dimensionless potential factor
46- 50 F5.2 --- t1k Cyclic orbital period of the companion
measured in 1/H
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Acknowledgements: Igor D.Karachentsev <ikar@sao.stavropol.su>
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(End) Patricia Bauer [CDS] 06-May-1996