Astrophys Space Sci (2009) 321: 101–107 DOI 10.1007/s10509-009-0019-5 ORIGINAL ARTICLE 2005 Photometric observations and multiple frequencies of the δ Scuti variable V350 Peg F. Ekmekçi · S. Topal Received: 17 March 2008 / Accepted: 26 February 2009 / Published online: 12 March 2009 © Springer Science+Business Media B.V. 2009 Abstract We present the V light curves of δ Scuti type variable V350 Peg, obtained between August and October 2005 at the Ankara University Observatory (AUG) and the TÜBÍTAK National Observatory (TUG). By application of multiple-frequency analyses using Period04 to 7878 pho- tometric V measurements (which are consist of our 747 V data and 7131 V data obtained at Monegrillo Observatory) of V350 Peg, a five-frequency solution was found to be fitted well to the data. In accordance with the computed Q values for V350 Peg, it was found that this star has probably radial mode with l = 0 and g-mode oscillations. Keywords Stars: variables: delta Scuti · Stars: individual (V350 Peg) 1 Introduction V350 Peg (SAO 73233, HIP 115563) was discovered dur- ing the Hipparcos mission (ESA 1997) to be a δ Scuti type pulsating star (F2) with a period of 0.2012 days and a to- tal amplitude of 0.05 mag. Vidal-Sáinz et al. (2002) used the observations of V350 Peg made in 1997, 1998 and in 2001, and showed that the star pulsates in a close doublet of frequencies separated by 0.17 c/d with similar amplitudes. And they pointed out that the period of V350 Peg listed in the Hipparcos Catalogue is not accurate. Afterwards, Vidal- Sáinz et al. (2003) found that these two frequencies of 5.840 F. Ekmekçi ( ) · S. Topal Faculty of Science, Ankara University, 06100 Tando˘ gan, Ankara, Turkey e-mail: fekmekci@science.ankara.edu.tr F. Ekmekçi e-mail: ekmekci@astro1.science.ankara.edu.tr and 5.668 c/d have remained stable since 1997 by using all the CCD photometric data acquired between 1997 July and 2002 October. In the study of ages, metallicities and kinematic properties of ∼14000 F and G dwarfs by Nord- ström et al. (2004), some photometric and other characteris- tics of V350 Peg are listed in Table 1 of their study related to Geneva-Copenhagen survey of the Solar neighbourhood. Recently, Bush and Hintz (2008) determined the rotational velocity, vsini, of V350 Peg as 45 km s −1 . There appears to be no further observations of this star in the literature. 2 Photometric observations Photometric observations of V350 Peg were carried out be- tween August and October 2005 with the 30 cm Maksutov telescope of the Ankara University Observatory (AUG) in B and V filters, and with the 40 cm Cassegrain telescope at the TÜBÍTAK National Observatory (TUG) in B, V, and R filters. Both telescopes are equipped with an SSP-5A pho- tometer containing a side-on R1414 Hamamatsu photomul- tiplier. The log of observations and the total measurements used in frequency analysis for V350 Peg are given in Ta- ble 1. Differential V measurements of Monegrillo Obser- vatory were taken from Vidal-Sáinz et al. (2002)’s study. During our observations of V350 Peg, BD + 29 4919 and BD + 30 4935 were monitored as comparison and check stars, respectively. The standard V magnitudes are obtained by using the transformation coefficients for the systems of TUG (given by Aslan 2000) and of AUG (given by Müyessero˘ glu 1992). The mean value of the B-V colour in- dex of V350 Peg was found to be of 0.353 ± 0.010 which is in a good agreement with the value of 0.36 which estimated from the B and V magnitudes obtained from SIMBAD data- base.