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J/A+A/402/801   Runaway carbon stars of Blanco & McCarthy field 37 (Loup+, 2003)

On the usefulness of finding charts. Or the runaway carbon stars of the Blanco & McCarthy field 37. Loup C., Delmotte N., Egret D., Cioni M.-R., Genova F. <Astron. Astrophys., 402, 801-804 (2003)> =2003A&A...402..801L
ADC_Keywords: Surveys ; Stars, carbon ; Magellanic Clouds ; Cross identifications Keywords: errata - catalogs - surveys - stars: carbon - Magellanic Clouds Abstract: We have been recently faced with the problem of cross-identifying stars recorded in historical catalogues with those extracted from recent fully digitized surveys (such as DENIS and 2MASS). Positions mentioned in the old catalogues are frequently of poor precision, but are generally accompanied by finding charts where the interesting objects are flagged. Those finding charts are sometimes our only link with the accumulated knowledge of past literature. While checking the identification of some of these objects in several catalogues, we had the surprise to discover a number of discrepancies in recent works.The main reason for these discrepancies was generally the blind application of the smallest difference in position as the criterion to identify sources from one historical catalogue to those in more recent surveys. In this paper we give examples of such mis-identifications, and show how we were able to find and correct them.We present modern procedures to discover and solve cross-identification problems, such as loading digitized images of the sky through the Aladin service at CDS, and overlaying entries from historical catalogues and modern surveys. We conclude that the use of good finding charts still remains the ultimate (though time-consuming) tool to ascertain cross-identifications in difficult cases. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 34 48 Cross-identification counts table2.dat 87 849 List of cross-identifications between the Blanco & McCarthy (1990AJ....100..674B), Kontizas et al. (2001, J/A+A/369/932), and DCMC (Cioni et al., 2000, II/228), catalogues
See also: II/228 : DENIS Catalogue toward Magellanic Clouds (DCMC) (Cioni+ 2000) J/A+A/369/932 : RI photometry of LMC carbon stars (Kontizas+, 2001) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
3- 4 I2 --- Field LMC-BM field number (1990AJ....100..674B) 9- 10 I2 --- NC* Number of BM C stars (All = 849) 15- 16 I2 --- NKDM Number cross-identified with KDM , Kontizas et al., 2001, Cat. J/A+A/369/932) using finding charts (All = 586) 21- 22 I2 --- NKDM3 Number cross-identified in KDM Table 3 (All = 527) 27- 28 I2 --- Nwci Number of wrong cross-identifications in KDM (All = 23) 33- 34 I2 --- Nmci Number of missed cross-identifications in KDM (All = 67)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 A5 --- LMC-BM LMC-BM number (fieldnumber-sourcenumber) 7- 10 I4 --- KDMK Actual [KDM2001] number: cross-identifications based on finding charts 12- 16 F5.1 arcsec Dist Distance between LMC-BM and [KDM2001] positions 18- 21 I4 --- KDMK2 ?=0 [KDM2001] number based on an automatic match with a radius of 30" 23- 27 F5.1 arcsec Dist2 Distance between LMC-BM and [KDM2001]2 positions 29- 32 I4 --- KDMK3 ?=0 [KDM2001] number based on an automatic match with a radius of 1' 34- 38 F5.1 arcsec Dist3 Distance between LMC-BM and [KDM2001]3 positions 40- 43 I4 --- KDMK4 ?=0 [KDM2001] number according to Kontizas et al. (J/A+A/369/932) Table 3 45- 49 F5.1 arcsec Dist4 Distance between LMC-BM and [KDM2001]4 positions 51- 68 A18 --- DCMC DCMC J identification (HHMMSS.ss+DDMMSS.s): cross-identifications based on finding charts 70- 87 A18 --- DCMC2 Double entries in the DCMC catalogue
Acknowledgements: Cecile Loup, loup(at)astro.u-strasbg.fr
(End) Patricia Vannier [CDS] 29-Jul-2008
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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