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J/AJ/77/486         Dwarf K and M stars in Southern hemisphere   (Upgren+, 1972)

Dwarf K and M stars in the southern hemisphere. Upgren A.R., Grossenbacher R., Penhallow W.S., Macconnell D.J., Frye R.L. <Astron. J., 77, 486-499 (1972)> =1972AJ.....77..486U
ADC_Keywords: Stars, dwarfs ; Stars, late-type ; Spectral types Abstract: In the course of the near-complete Michigan Spectral Survey of the Southern sky, 624 dwarf stars of type K2V and later have been identified. Many of these stars are previously unrecognized as nearby late dwarfs. The plates used are the Curtis Schmidt 10° prism plates taken for the HD reclassification project. Description (by B. Skiff, 2011-Feb): The published coordinates were relatively poor, and something like 15 percent of the entries contain errors large enough to render the stars unrecoverable. Jack MacConnell, one of the co-authors, supplied me with a working list of corrections compiled in 1983, and I have made many more. A short list of corrections was published in the later long paper by Bidelman & MacConnell (1973AJ.....78..687B, Table IIb). In view of the renewed interest in nearby low-mass stars -- different from the concerns of the early 1970s! -- it seemed well worth revising the list. Several of the K dwarfs here are now known to have L- and T-dwarf companions in addition to more ordinary M-dwarfs. The list was contained in the Hipparcos input catalogue (Cat. I/196), and thus the great majority have good coordinates and parallaxes already in SIMBAD as a result of this. However, a number of stars had incorrect HD or Durchmusterung names and other problems which led to the wrong star being linked with these observations. I worked from the SIMBAD list, and then checked every entry against various catalogues and SIMBAD itself. Three stars were inexplicably omitted from SIMBAD, which are restored here. Despite having Hipparcos positions for most of the stars, I have adopted instead either UCAC2 or Tycho-2 positions with the thought that in principle the improved proper motions should yield more nearly correct places for both epoch and equinox J2000. The source of the position is shown for each entry by the letter-code following it (in the 's' column). The only exceptions are for pairs that are not resolved in the catalogues just mentioned, where 2MASS positions close to epoch 2000 are given. Where the combined light of a pair is clearly intended, I show the mid-point position rounded to 1" precision. The few 'lost' stars are shown with 1' positions as given in the original table, and also the comment "no candidates" in the remarks. I searched for these at the common offsets appearing elsewhere in the list: ±1m in RA, ±7', ±22', ±1 ° in Dec. These non-found stars are UGP 272, 278, 454, 475, 496, 531. Double-star components are specified in the remarks. Several of the double stars are "new" in the sense of being not present in SIMBAD or the WDS, and are possibly unreported common-motion pairs. Separations are given to 0".1 precision for those < 1", to 0".5 between 1 and 5", and to 1" for wider pairs. A "close pair" is one where the components are nearly equal and are unresolved in the astrometric catalogues; most such pairs exhibit rapid orbital motion also have published orbits of short period due to the proximity of the stars (to each other and to us!). Although not new, some of the pairs are identified separately for the first time, but appear as a single entry in SIMBAD. I have added the suffix 'a' or 'b' to the SIMBAD name as necessary. The succeeding several columns show HD, BD, CD, and CPD names. Many of these names are missing or in error in the published list. I used VizieR to assign the names after the revised positions had been determined. Some care was taken to account for proper motion back to the epoch of these various surveys in order to assign the correct name. The magnitudes are generally those shown in the SIMBAD header-listing. Sometimes these are wrong due to misidentification or other errors (such as in Eggen's tables). If two decimals are shown, the data are usually from either the Mermilliod "mean UBV" catalogue (Cat. II/168) or derived from Hipparcos/Tycho results. Single-decimals are data I found from published photometry (often in the SIMBAD data-blocks but not in the headers for the same star), or from sources such as ASAS-3. Magnitudes for the doubles were adjusted to be either for the combined light or of a single component as relevant. The MK spectral types are as published by Upgren et al. Note that these are not necessarily what's in the SIMBAD headers, which derive from numerous unspecified sources. Often the match is very close or identical when the source is this paper or the Houk Michigan catalogues (based on the same plates, and indeed remarks in the paper suggest Houk may have in fact classified a few stars). Apart from a few giants sneaking in, the types appear to be of high quality. The remarks are a mixed bag of comments. I give 'lg pm' when the star has large proper motion (viz ≥0".15/year) according to the astrometric catalogue source. This is mainly for my own use, though there may be some interest in the nearby stars that have quite small motion. I show SIMBAD IDs as relevant, i.e. when there are multiple entries for the star under different aliases, coordinates etc. Because of the poor source positions, there are a lot of them. Nearly every star has an ID in the HD or one of the DM. If not, then I add the Tycho identifier in the remarks. There are several IDs with the larger list of K/M dwarfs by Stephenson (1986AJ.....91..144S, Cat. III/259). N.B. the large number of IRAS and ROSAT (RX, 1RXS) identifications. I was quite conservative in assigning these, so the IDs are certain. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file ugp.dat 159 624 Dwarf K and M stars, with astrometric connection
See also: III/10 : G5 and later stars in a North Galactic Pole Region (Upgren 1962) III/12 : F5 and later stars in S.A. 28, 54, 106, 107 Byte-by-byte Description of file: ugp.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [UGP] 5- 7 I3 --- UGP [1,624] Number in table1 of paper 11- 12 I2 h RAh Right Ascension J2000 (hours) 14- 15 I2 min RAm Right Ascension J2000 (minutes) 17- 21 F5.2 s RAs Right Ascension J2000 (seconds) 23 A1 --- DE- Declination J2000 (sign) 24- 25 I2 deg DEd Declination J2000 (degrees) 27- 28 I2 arcmin DEm Declination J2000 (minutes) 30- 33 F4.1 arcsec DEs ? Declination J2000 (seconds) 35 A1 --- s [MTU] Source of position (1) 37- 42 I6 --- HD ? HD identification of star 44- 46 A3 --- BDz BD identification: zone 48- 51 I4 --- BDn ? BD identification; number in zone 53- 55 I3 --- CDz ? CD identification: zone 57- 61 I5 --- CDn ? CD identification; number in zone 63- 65 I3 --- CPz ? CPD identification: zone 67- 71 I5 --- CPn ? CPD identification; number in zone 73- 77 F5.2 mag Vmag Visual approximative magnitude 80- 85 A6 --- SpT MK spectral type 88-159 A72 --- Comment Notes and comments (from B. Skiff)
Note (1): position sources (column 's'): M = 2MASS (2006AJ....131.1163S, II/246) T = Tycho-2 (2000A&A...357..367H, I/259) (or any of the HIP/TYC-based catalogues) U = UCAC2 (2004AJ....127.3043Z, I/289)
History: * 04-May-2007: first version prepared by Brian Skiff [Lowell Obs.] * 06-Feb-2011: revisited by Brian Skiff [Lowell Obs.]. List matched against the WDS; about two dozen new M-dwarf companions were found within a ∼1' radius of UGP stars.
(End) Brian Skiff [Lowell Obs.], Francois Ochsenbein [CDS] 16-Feb-2011
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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