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15Discovery of five new eclipsing systems of W UMa type
A. Liakos
Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, Metaxa & Vas. Pavlou St., Penteli, Athens, Greece
ISSN 2221-0474
DOI: 10.24411/2221-0474-2020-10002
Received: 30.12.2019; accepted: 3.09.2020
(E-mail for contact: alliakos@noa.gr)
# |Name Other Coord (J2000) Type Max Min System Period Epoch (JD) ÎXP-e Sp. Comment L.Curve Find.Chart Data
1 USN0-A2.0 1350-03467786 03 27 45.61, +45 17 20.17 EW 14.5 14.77 R 0.39180 2458425.48706 min Comm. 1 LC USN0-A2.0 1350-03467786.jpg FoV USN0-A2.0 1350-03467786.jpg A2.0 1350-03467786.txt
2 USN0-A2.0 1275-02644421 03 45 53.35, +37 45 09.70 EW 15.6 15.70 R 0.29969 2458376.47059 min Comm. 2 LC USN0-A2.0 1275-02644421.jpg FoV USN0-A2.0 1275-02644421.jpg A2.0 1275-02644421.txt
3 USN0-A2.0 0900-14578525 19 18 48.08, +06 37 56.63 EW 17.3 17.65 R 0.67246 2458317.50558 min Comm. 3 LC USN0-A2.0 0900-14578525.jpg FoV USN0-A2.0 0900-14578525.jpg A2.0 0900-14578525.txt
4 USN0-A2.0 1125-16127402 20 29 12.19, +24 36 47.80 EW 14.8 15.05 R 0.30718 2455392.56492 min Comm. 4 LC USN0-A2.0 1125-16127402.jpg FoV USN0-A2.0 1125-16127402.jpg A2.0 1125-16127402.txt
5 USN0-A2.0 1425-15515944 23 45 05.41, +57 00 51.24 EW 17.5 18.03 R 0.29917 2458081.27500 min Comm. 5 LC USN0-A2.0 1425-15515944.jpg FoV USN0-A2.0 1425-15515944.jpg A2.0 1425-15515944.txt
Comments:
1. The system USNO-A2.0 1350-03467786 (indicated as V in the finding chart) is located in the Field of View of the planetary nebula HDW 3. USNO-A2.0 1350-03466399 and USNO-A2.0 1350-03461726 were used as Comparison (C) and Check (K) stars, respectively, and they are also indicated in the finding chart. MaxI-MinI ~ MaxI-MinII —0.27 mag in R-filter. The maximum magnitude in R-filter is given in the USN0-A2.0 Catalog (Monet et al. 1998). Other cross identifications for the variable: NOMAD1 13520077531. The observations were carried out at the Kryoneri Observatory of the National Observatory of Athens, Corinthia, Greece between September and December 2018 using a 1.2-m prime focus telescope (f/3) equipped with the APOGEE ASPEN CG47 CCD camera and the R (Bessell) photometric filter.
2. The system USNO-A2.0 1275-02644421 (indicated as V in the finding chart) is located in the Field of View of the planetary nebula HaWe 5. USNO-A2.0 1275-02639026 and USNO-A2.0 1275-02643221 were used as Comparison (C) and Check (K) stars, respectively, and they are also indicated in the finding chart. MaxI-MinI = -0.095 mag and MaxI-MinII = -0.09 mag in R-filter. The maximum magnitude in R-filter is given in the USNO-A2.0 Catalog (Monet et al. 1998). Other cross identifications for the variable: NOMAD1 1277-0076480. The observations were carried out at the Kryoneri Observatory of the National Observatory of Athens, Corinthia, Greece between September and December 2018 using a 1.2-m prime focus telescope (f/3) equipped with the APOGEE ASPEN CG47 CCD camera and the R (Bessell) photometric filter.
3. The system USNO-A2.0 0900-14578525 (indicated as V in the finding chart) is located in the Field of View of the planetary nebula NGC 6781. USNO-A2.0 0900-14575744 and USNO-A2.0 0900-14575325 were used as Comparison (C) and Check (K) stars, respectively, and they are also indicated in the finding chart. MaxI-MinI = -0.35 mag and MaxI-MinII = -0.33 mag in R-filter. The maximum magnitude in R-filter is given in the USNO-A2.0 Catalog (Monet et al. 1998). Other cross identifications for the variable: NOMAD1 0966-0493572, 2MASS J19184804+0637562. The observations were carried out at the Kryoneri Observatory of the National Observatory of Athens, Corinthia, Greece between July and September 2018 using a 1.2-m prime focus telescope (f/3) equipped with the APOGEE ASPEN CG47 CCD camera and the R (Bessell) photometric filter.
4. The system USNO-A2.0 1125-16127402 (indicated as V in the finding chart) is located in the Field of View in the FoV of AW Vul and the variable 2MASS J20275736+2453029 (Liakos & Niarchos 2011). The star could also be a delta Sct variable with a dominant period of 0.1536 days. However, J-H = 0.52 from the 2MASS catalogue suggests a rather cool star (K type), therefore the EW-type variability seems more suitable. USNO A2.0 1125-16127586 and USNO A2.0 1125-16126802 were used as Comparison (C) and Check (K) stars, respectively, and they are also indicated in the finding chart. MaxI-MinI ~ MaxI-MinII —0.25 mag in R-filter. The maximum magnitude in R-filter is given in the USNO-A2.0 Catalog (Monet et al. 1998). Other cross identifications for the variable: 2MASS J20291217+2436475. The observations were carried out at the University of Athens Observatory, Athens, Greece in July 2010 using a 20-cm newtonian reflector telescope (f/5) equipped with the SBIG ST-8XME CCD camera and the R (Bessell) photometric filter.
5. The system USNO-A2.0 1425-15515944 (indicated as V in the finding chart) is located in the Field of View of the planetary nebula A66 82 and the variable EG Cas. USNO-A2.0 1425-15522780 and USNO-A2.0 1425-15522749 were used as Comparison (C) and Check (K) stars, respectively, and they are also indicated in the finding chart. MaxI-MinI = -0.53 and MaxI-MinII = -0.49 mag in R-filter. The maximum magnitude in R-filter is given in the USNO-A2.0 Catalog (Monet et al. 1998). Other cross identifications for the variable: NOMAD1 1470-0525441. The observations were carried out at the Kryoneri Observatory of the National Observatory of Athens, Corinthia, Greece between October and November 2017 using a 1.2-m prime focus telescope (f/2.8 using a focal reducer) equipped with the ANDOR ZYLA 5.5 sCMOS camera and the R (Bessell) photometric filter.
Remarks:
In this study, photometric elements of five newly discovered W UMa- type eclipsing binaries are presented for the first time. Their variability was detected for the first time as a by-product during observations of other targets. Differential magnitudes were obtained for all targets using the software Muniwin v. 1.1.29 (Hroch 1998).
References:
Hroch, F., 1998, Proceedings of the 29th Conference on Variable Star Research, 30 Liakos, A., Niarchos, P., 2011, Information Bulletin on Variable Stars, 5998, 3
Monet D., Bird A., Canzian B., et al., 1998, USNO-A2.0, A Catalog of Astrometric Standards, (U.S. Naval Observatory, Washington, DC), Centre de Données Astronomiques de Strasbourg, I/252
