J/other/JAD/16.2 New times of maximum of CY Aqr (Tuvikene+, 2010) ================================================================================ New times of maximum of CY Aquarii. Tuvikene T., Sterken C., Brogt E., Cont D., Henden A., Papadaki C., Volkov I., Wiedemair C. =2010JAD....16....2T ================================================================================ ADC_Keywords: Stars, variable ; Photometry, UBVRI ; Photometry, CCD Keywords: technique: photometric - stars: CY Aqr Abstract: We present a collection of 102 new times of maximum of the SX Phoenicis star CY Aquarii. These times, together with 20 times of maximum taken from the literature, lead to a new local linear ephemeris for 2003-2009 with a formally slightly shorter period than the one for 1996-2002. It will require at least another half decade of additional monitoring before any significant update to any model can be considered. Such monitoring should preferably occur at regular intervals, be done in a consistent photometric band, and at high time resolution. A set of 114 new times of maximum obtained since 2002 leads to a new local linear ephemeris for 2003-2009: Tmax=2426159.512(+/-0.001)+0.061038349E(+/-0.000000002). Objects: --------------------------------------------- RA (2000) DE Designation(s) --------------------------------------------- 22 37 47.9 +01 32 04 CY Aqr = V* CY Aqr --------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 62 11 Journal of photometric observations usno.dat 22 290 USNO UVIc photometry tass.dat 25 41 TASS VIc photometry photdiff.dat 33 26134 All differential photometry table3.dat 32 122 Times of maximum light of CY Aqr phot/* . 9 Individual files for differential photometry -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 8 F8.2 d JD1 Start observation date (JD-2400000) 9 A1 --- --- [-] 10- 17 F8.2 d JD2 End observation date (JD-2400000) 19- 22 A4 --- Site Observation site (G1) 24 I1 --- N Number of nights with at least one Tmax 26- 29 A4 --- Band Photometric band(s) of observation 30- 34 I5 --- Data Number of measurements 36- 41 A6 --- Observ Observer(s) code (2) 43- 44 A2 --- Red Initials of the author who carried out the data reduction (2) 46- 62 A17 --- FileName Name of the file with photometry -------------------------------------------------------------------------------- Note (2): Observer code as follows: EB = E. Brogt DC = D. Cont AH = A. Henden CP = C. Papadaki CS = C. Sterken TT = T. Tuvikene IV = I. Volkov CW = C. Wiedemair -------------------------------------------------------------------------------- Byte-by-byte Description of file: tass.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 13 F13.5 d HJD Heliocentric Julian date 15- 19 F5.3 mag dVmag Differential Johnson V magnitude 21- 25 F5.3 mag dIcmag Differential Cousins I magnitude -------------------------------------------------------------------------------- Byte-by-byte Description of file: usno.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 13 F13.5 d HJD Heliocentric Julian date 15- 20 F6.3 mag mag Magnitude 22 A1 --- Band [UVI] Photometric band of observation -------------------------------------------------------------------------------- Byte-by-byte Description of file: photdiff.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 A4 --- Site Observation site (G1) 5- 8 A4 --- n_Site Note on Site (2) 10- 23 F14.6 d HJD Heliocentric Julian date 25- 31 F7.4 mag Dmag Differential magnitude 33 A1 --- Band [BV] Photometric band of observation -------------------------------------------------------------------------------- Note (2): For OCA observtions, b for B band, fast for filterless. -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 F10.4 d Tmax Time of maximum light (HJD-2400000) 12 I1 --- W [1,5]? Weight 14- 19 I6 --- E Cycle number 21- 30 A10 --- Ref Source of the time of maximum (1) 32 A1 --- Band [UBVRI]? Photometric passband (2) -------------------------------------------------------------------------------- Note (1): Source refers to this paper and to references in the literature as: DKB2009 = Derekas et al. (2009MNRAS.394..995D) FSB2004 = Fu et al. (2004, ASP Conf. Ser. 318, 346) HPW2005 = Hubscher et al. (2005IBVS.5657....1H) BBC2006 = Biro et al. (2006IBVS.5684....1B) LFZ2007 = Li et al. (2007, J. Beijing Normal University, 43, 621) P2007 = Paschke (2007OEJV...73....1P) P2009 = Paschke (2009OEJV..116....1P) Note (2): A blank value means filterless photometry -------------------------------------------------------------------------------- Byte-by-byte Description of file: phot/* -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 14 F14.6 d HJD Heliocentric Julian date 16- 22 F7.4 mag Dmag Differential magnitude 24 A1 --- Band [BV] Photometric band of observation -------------------------------------------------------------------------------- Global notes: Note (G1): Observatory sites and observations as follows: USNO = CCD frames were acquired with the USNO-Flagstaff 1.0-m telescope on October 21 and 29, 1998 (V and Ic band, respectively) and on December 15, 1998 and January 17, 1999 (U band). TASS = This is a simultaneous V/Ic set from September 19, 2000, using the USNO TASS Sky Survey camera. SKO = Observations with the 1.3-m Ritchey-Chretien telescope were made at Skinakas Observatory (SKO, Greece) on August 31 and September 1, 2004. OHL = Observatorium Hoher List. On October 7-13, 2004, CCD frames were acquired at Observatorium Hoher List (OHL) in Germany, using the 1-m Cassegrain-Nasmyth telescope. MLO = Mount Laguna Observatory. In September 2004 the Smith 24-inch telescope at Mount Laguna Observatory (MLO, San Diego State University, CA) was used. SAI = Crimean Laboratory of the Sternberg Astronomical Institute. In October-November 2004 observations were made at the Sternberg Astronomical Institute Crimean Station (SAI). The following setups were used: on October 25 the Zeiss 60-cm Cassegrain telescope equipped with an Apogee-7 camera; on October 27-30 and November 1, the Maksutov 50-cm telescope with a Pictor 416 CCD camera. OCA = Observatorio Cerro Armazones. The star was intensely observed with the 84-cm telescope at Observatorio Cerro Armazones (OCA), Chile during 6 nights in July 2005. MDM = MDM Observatory. On October 30 and 31, 2007 the 2.4-m Hiltner telescope at the MDM Observatory, Arizona, USA. SAAO = South African Astronomical Observatory. In November 2005 the 1.0-m telescope at the South African Astronomical Observatory (SAAO), Sutherland, South Africa. RGB = Realgymnasium Bruneck. From September 19 to December 28, 2008, 14 partial nights of observations were obtained by a team of students from the Realgymnasium Bruneck (RGB, Suedtirol, Italy) under the supervision of CW. A Meade LX200 telescope with an SBIG ST8-XME CCD camera was used on the college roof. -------------------------------------------------------------------------------- Acknowledgements: Christiaan Sterken, csterken(at)vub.ac.be ================================================================================ (End) Patricia Vannier [CDS] 13-Dec-2011