Revista Mexicana de Astronomía y Astrofísica ISSN: Instituto de Astronomía México

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1 Revista Mexicana de Astronomía y Astrofísica ISSN: rmaa@astroscu.unam.mx Instituto de Astronomía México Orlov, V. G.; Guerrero, C. A.; Voitsekhovich, V. V. SPECKLE INTERFEROMETRY AT THE OBSERVATORIO ASTRONOMICO NACIONAL. V Revista Mexicana de Astronomía y Astrofísica, vol. 50, núm. 1, 2014, pp Instituto de Astronomía Distrito Federal, México Available in: How to cite Complete issue More information about this article Journal's homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative

2 Revista Mexicana de Astronomía y Astrofísica, 50, (2014) SPECKLE INTERFEROMETRY AT THE OBSERVATORIO ASTRONÓMICO NACIONAL. V V. G. Orlov, C. A. Guerrero, and V. V. Voitsekhovich Instituto de Astronomía Universidad Nacional Autónoma de México, México, D.F., Mexico Received 2013 December 6; accepted 2014 February 5 RESUMEN Presentamos mediciones de estrellas binarias mediante interferometría de motas (speckle), realizadas en septiembre, octubre y noviembre de 2009 con el telescopio de 1.5-m del Observatorio Astronómico Nacional en SPM (México). Reportamos los resultados de 645 medidas de 504 pares de estrellas, con una magnitud límite para la primaria de V = Las separaciones angulares van desde hasta pares tienen separaciones de menos de 1. El error medio en las separaciones es de 0.033, y el de los ángulos de posición, 0.9. La ambigüedad de 180, usual en este tipo de mediciones, fue corregida para la mayoría de los pares usando observaciones de otros autores. ABSTRACT We present speckle interferometric measurements of binary stars performed during September, October and November of 2009 with the 1.5-m telescope of the Observatorio Astronómico Nacional at SPM (Mexico). We report here the results of 645 measurements of 504 pairs of stars with a primary limiting magnitude of V = The measured angular separations range from to pairs have separations of less than 1. The mean error in separation is and in position angle, 0.9. The usual 180 ambiguity was corrected for the majority of position angles by comparison with observations performed by other observers. Key Words: binaries: visual stars: fundamental parameters techniques: high angular resolution techniques: interferometric 1. INTRODUCTION This is the fifth paper in the series of publications presenting the results of speckle interferometric observations of binary stars performed with telescopes of the Observatorio Astronómico Nacional (OAN) of the Instituto de Astronomía, Universidad Nacional Autónoma de México. Regular speckle interferometric measurements of binary stars have been made with telescopes of the OAN since 2008 (Orlov et al. 2009). This paper presents the results of double star observations carried out with the 1.5-m Telescopes of Sierra San Pedro Mártir (SPM), OAN, in September, October and November of During the observations we used only one broadband filter R (630/120 nm). 2. OBSERVATIONS AND RESULTS The observations were performed at the 1.5-m telescope of the OAN which is located at the OAN- SPM (Mexico). For these observations we used the DRAGON equipment (Voitsekhovich et al. 2005), which was slightly modified to be able to record speckle interfer- TABLE 1 DISTRIBUTION OF PAIRS BY THEIR SEPARATIONS > <

3 152 ORLOV, GUERRERO, & VOITSEKHOVICH TABLE 2 SPECKLE MEASUREMENTS ON THE 1.5-M TELESCOPE TDS TDS TDS HO HO HO209AB OL COU STF3056AB COU COU COU HU COU847AB HO HDS COU649AB COU BU487BC J J HDS AC HU TDS TDS HU COU COU TDS COU COU STF STF HU HO COU HU TDS COU COU ES COU COU COU COU COU COU COU COU COU COU COU COU ES COU COU TDS COU HO COU A922Aa, Ab (Mason & Hartkopf 2001) COU COU COU COU COU A (Hartkopf & Mason 2009) TDS ES ES A437AB

4 SPECKLE INTERFEROMETRY AT THE OBSERVATORIO ASTRONÓMICO NACIONAL. V TDS HU HU HU COU ES COU (Hartkopf & Mason 2009) COU COU COU COU COU TDS VKI A929AB A929AB COU HDS HDS COU BU BU BU BU COU COU DOO DOO A1260AB (Olevic et al. 2003) A HU COU TDS POP54AB POP54AB COU COU ES HO COU COU ES ES A1913AB (Baize 1987) TDS TDS HLD MLB MLB COU COU COU COU BU508AB BU508AB COU COU COU TDS COU COU668Aa, Ab COU668Aa, Ab COU668Aa, Ab COU (Docobo & Ling 2005) HU HU HU HU (Olevic & Jovanovic 2001) COU ES COU COU COU A

5 154 ORLOV, GUERRERO, & VOITSEKHOVICH BU BU ES ES TDS TDS COU COU A TDS TDS COU COU HDS COU HO COU COU A COU COU ES COU COU A TDS COU HU COU HO TDS TDS HU COU COU HU COU HU HU TDS COU COU COU A PTT4BC COU COU COU HDS314Aa, Ab (Ling 2012b) COU A964Aa, Ab HU A COU COU HDS A STF ES324BC YR STT (Scardia et al. 2001) HDS A COU BU COU BU523AB COU COU COU COU COU COU COU

6 SPECKLE INTERFEROMETRY AT THE OBSERVATORIO ASTRONÓMICO NACIONAL. V COU MLB MLB COU COU COU A A COU555AB HU COU TDS COU COU COU COU HU HU ES HO HO COU COU HO500AB MLB AG63AB AG63AB AG63AB AG63AB COU1075Aa, Ab COU1075Aa, Ab COU1075Aa, Ab COU1075Aa, Ab HO COU COU COU COU COU COU COU COU COU ES COU COU COU COU COU A TDS HU COU COU COU A (Docobo & Ling 2010) COU HO COU COU COU OL OL OL COU COU688Aa, Ab COU688Aa, Ab POP COU COU COU TDS TRU BU880AB

7 156 ORLOV, GUERRERO, & VOITSEKHOVICH COU COU COU COU STT MLB MLB STT64AB COU COU COU HU BRT COU ES COU HU BU540AB COU HO COU ES STF481AB COU TDS COU COU COU COU BU1277AB ES TDS COU COU HU BU (Muller 1978) HO (Hartkopf, Mason, & Rafferty 2008) COU COU COU COU COU COU BU86AB STT77AB (Starikova 1985) COU COU HU HU COU HO TDS TDS TDS KU GHE13Aa, Ab COU COU (Couteau 1999) COU COU COU COU COU COU COU MLB MLB HDS MLB COU HO HDS COU COU

8 SPECKLE INTERFEROMETRY AT THE OBSERVATORIO ASTRONÓMICO NACIONAL. V COU COU A COU COU COU888Aa, Ab COU COU POP COU COU HDS COU COU HDS AG COU COU COU HU HDS COU COU TDS COU COU HU COU COU COU COU COU POP COU COU ES2158AC ES2158AB COU COU A A HO L COU TDT A TDT ES A TDT COU HU COU A (Docobo & Ling 2009) TDT TDS COU STF TDT TDT1269AB COU HU HDS TDS TDS J COU COU COU COU HDS STF2525AB (Heintz 1984) AG TDT

9 158 ORLOV, GUERRERO, & VOITSEKHOVICH TDT A A272AB COU TDT TDT COU HU COU ES COU ES2350AB TDT TDT STT541BC A TDT TDT TDT J ES COU ES COU WOR9AB (Zirm 2003) COU HDS TDT TDS A COU HEI COU COU COU STT417AB STT (Zirm 2013) STT (Zirm 2013) BU367AB (Scardia et al. 2003) COU2222Aa, Ab COU COU COU COU COU COU TDS COU COU COU COU TDT COU COU J COU COU835AB HU A BU446AB BU446AB COU COU COU A SEI COU COU732Aa, Ab TDT COU COU SKF245AC COU1185AB COU

10 SPECKLE INTERFEROMETRY AT THE OBSERVATORIO ASTRONÓMICO NACIONAL. V HO (Couteau 1958) HDS HDS COU COU ES2200BC ES2200BC HLD TDT HDS TDT COU HO610AB HO610AB A COU HDS COU A (Baize 1986) TDT COU COU (Docobo & Ling 2012) COU COU COU EGG COU A TDT BU STF A COU ES COU BU (Ling 2012a) TDT TDT TDT TDT COU COU TDT HDS POP POP HO A TDT HU HU HDS3233Aa, Ab HDS3233Aa, Ab COU TDT TDT HDS TDT COU TDT COU TDT HU (Baize 1985) HU (Baize 1985) COU843Aa, Ab ES J COU STF COU741Aa, Ab COU COU COU COU

11 160 ORLOV, GUERRERO, & VOITSEKHOVICH COU TDT BU852BC HDS3305AB HDS3305AB HDS (Cvetkovic 2013) HDS (Cvetkovic 2013) TDT HU COU FOX FOX COU COU A COU COU COU ES ES STF STF J COU WNC6AB TDT TDT TDT TDT TDT TDT A A HU ES ES COU COU HU HU BU858AB COU COU COU943Aa, Ab A A COU A COU245AB A1496AB COU A A A HO206AB ograms (Orlov et al. 2007, 2010). During the observations we had good seeing conditions. We estimated the seeing was between 0.6 to 0.9 arcsec. Aberrations introduced by the telescope have similar values. As a result, long exposure images have a resolution of about 1.5 arc seconds. All the measurements were made through the R (630/120 nm) filter. After calibration we determined the pixel scale of /px and the detector orientation. More than half of the observed binaries have separations less than 1. Table 1 shows how these 506 pairs are distributed according to their separations. Table 2 contains 645 measurements of 504 pairs of stars. The first column contains the epoch-2000 coordinates in the format used in the Washington Double Star (WDS) Catalog (Worley & Douglass 1997). The second column gives the name of the star or the discoverer designation. The third column gives the epoch of the observation in fractional Besselian years. The four following columns contain the mea-

12 SPECKLE INTERFEROMETRY AT THE OBSERVATORIO ASTRONÓMICO NACIONAL. V 161 sured position angles given in degrees, the errors of their determination, the angular distances in arcseconds and the errors of their determination. The last three columns give the difference between the observations and the ephemerides calculated for the date of observation, as well as references to publications in which orbital elements can be found (Hartkopf & Mason 2003). 3. CONCLUSION We have presented the results of binary star observations focused on binaries from the WDS catalogue. In particular, we have been interested in the new binaries discovered by Hipparcos. We confirmed 52 new binaries detected by Hipparcos. The speckle interferometry program at the OAN telescopes is supported by the Direccion General de Asuntos del Personal Academico (UNAM, México) under project IN REFERENCES Baize, P. 1985, A&AS, 60, , A&AS, 65, , A&AS, 71, 177 Couteau, P. 1958, Journal des Observateurs, 41, , Catalogue de 2700 Etoiles Doubles COU (3rd. ed.; Nice: Obs. Cote d Azur) Cvetkovic, Z. 2013, IAU Comm. 26, Inf. Circ. 179 Docobo, J. A., & Ling, J. F. 2005, IAU Comm. 26, Inf. Circ , AJ, 138, , IAU Comm. 26, Inf. Circ , IAU Comm. 26, Inf. Circ. 177 Hartkopf, W. I., & Mason, B. D. 2003, Sixth Catalog of Orbits of Visual Binary Stars (Washington: USNO), Hartkopf, W. I., & Mason, B. D. 2009, AJ, 138, 813 Hartkopf, W. I., Mason, B. D., & Rafferty, T. 2008, AJ, 135, 1334 Heintz, W. D. 1984, A&AS, 56, 5 Ling, J. F. 2012a, AJ, 143, 20 Ling, J. F. 2012b, IAU Comm. 26, Inf. Circ. 176 Mason, B. D., & Hartkopf, W. I. 2001, IAU Comm. 26, Inf. Circ. 144 Muller, P. 1978, A&AS, 32, 173 Olevic, D., & Jovanovic, P. 2001, Serbian AJ, 163, 5 Olevic, D., Popovic, G. M., Pavlovic, R., & Cvetkovic, Z. 2003, Serbian AJ, 166, 43 (erratum in 2003, Serbian AJ, 167, 111) Orlov, V. G., Voitsekhovich, V. V., Mendoza-Valencia, G. A., Svyryd, A., Rivera, J. L., Ortiz, F., & Guerrero, C. A. 2009, RevMexAA, 45, 155 Orlov, V. G., Voitsekhovich, V. V., Rivera, J. L., Guerrero, C. A., & Ortiz, F. 2010, RevMexAA, 46, 245 Orlov, V. G., Voitsekhovich, V. V., Sánchez, L. J., & Garfias, F. 2007, RevMexAA, 43, 137 Scardia, M., Prieur, J.-L., Koechlin, L., & Aristidi, E. 2001, Astron. Nachr., 322, , IAU Comm. 26, Inf. Circ. 151 Starikova, G. A. 1985, Trudy Gos. Astron. Inst. Sternberga, 57, 243 Voitsekhovich, V. V., Sánchez, L. J., Orlov, V. G., Garfias, F., & Benítez, R. 2005, RevMexAA, 41, 399 Worley, C. E., & Douglass, G. G. 1997, A&AS, 125, 523 Zirm, H. 2003, IAU Comm. 26, Inf. Circ. 151 Zirm, H. 2013, IAU Comm. 26, Inf. Circ. 179 V. G. Orlov, V. V. Voitsekhovich, and C. A. Guerrero: Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal , 04510, México, D.F., Mexico (orlov@astro.unam.mx).