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J/AJ/110/2747       Stars in Sculptor dwarf spheroidal galaxy (Schweitzer+ 1995)

The absolute proper motion and a membership survey of the Sculptor dwarf spheroidal galaxy Schweitzer A.E., Cudworth K.M., Majewski S.R., Suntzeff N.B. <Astron. J. 110, 2747 (1995)> =1995AJ....110.2747S
ADC_Keywords: Proper motions ; Cross identifications Abstract: Using 26 plates taken over the course of more than half a century, we present proper motions and photometry for 1177 stars in the central region of the Sculptor dwarf spheroidal galaxy, down to a limiting magnitude of V∼20.25 at the level of the horizontal branch. The proper-motion cleaned color-magnitude diagram retained a broad giant branch, further supporting an intrinsic spread in metallicity. We determined an absolute proper motion for Sculptor, relative to background galaxies, of mu_alpha=+0.036±0.022arcsec/century and mu_delta=0.043±0.025arcsec/century after correcting for the LSR and peculiar solar motions. Our proper-motion uncertainty is similar to or smaller than those obtained by different groups for other distant satellites of the Galaxy. When combined with Sculptor's distance and radial velocity, this measurement shows the dwarf spheroidal to have a space velocity of roughly 220±125km/s. Although our measurement is less than twice its uncertainty, the direction of Sculptor's motion is significant because it rules out motion along the Magellanic Stream. A 2.5 sigma error allows for motion in a direction toward the Fornax dwarf spheroidal galaxy, so Sculptor remains a possible member of the proposed Fornax-Leo-Sculptor stream. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 114 1183 Sculptor photometry, membership probabilities, positions, and proper motions table4.dat 114 34 Photometry and positions of possible variable stars in Sculptor
Byte-by-byte Description of file: table3.dat table4.dat
Bytes Format Units Label Explanations
1- 5 I5 --- SCMS Identification from this study 7- 10 I4 --- V78 ? ID from Van Agt, 1978PDDO....3..205V 12- 17 A6 --- H65 ID from Hodge, 1965ApJ...142.1390H 19- 21 I3 --- KD77 ? ID from Kunkel & Demers, 1977ApJ...214...21K 23- 25 I3 --- FBM82 ? ID from Frogel et al., 1982ApJ...252..133F 31- 35 F5.2 mag Vmag V magnitude 37- 41 F5.2 mag B-V B-V color index 43- 45 I3 % PMemb *? Probability of membership 47- 54 F8.1 arcsec Xpos X coordinate relative to dSph center 56- 63 F8.1 arcsec Ypos Y coordinate relative to dSph center 66- 68 I3 h RAh Right Ascension (J2000) 70- 71 I2 min RAm Right Ascension (J2000) 73- 77 F5.2 s RAs Right Ascension (J2000) 80 A1 --- DE- Declination sign (J2000) 81- 82 I2 deg DEd Declination (J2000) 84- 85 I2 arcmin DEm Declination (J2000) 87- 90 F4.1 arcsec DEs Declination (J2000) 92- 97 I6 10-2mas/yr pmX ? Relative proper motion 99-102 I4 10-2mas/yr e_pmX ? Standard error in pmX 104-109 I6 10-2mas/yr pmY ? Relative proper motion 111-114 I4 10-2mas/yr e_pmY ? Standard error in pmY
Note on PMemb: Probability of membership, only for table3.dat. The background galaxies, for which the stellar profile-fitting photometry may be unreliable, are listed at the beginning with a membership probability of -1.
Origin: AAS CD-ROM series, Volume 7, 1996 Lee Brotzman [ADS] 14-Jul-1996
(End) [CDS] 30-Jan-1997
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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