UBV(RI)$_{\mathsf {C}}$ photometric sequences for symbiotic stars. III

Abstract

We present accurate UBV(RI) C photometric sequences and astrometric positions for a final set of 41 symbiotic stars. In a similar manner to the 40 targets of Papers I and II, these sequences extend over wide brightness and color ranges and are suited to covering both quiescence and outburst phases. They are intended to assist both the CCD photometric monitoring of current variability and exploitation of old photographic plates from historical archives.

Recent photometry of symbiotic stars

“…Refs. : 1 - Henden & Munari (2006), 2 -Blanco et al (1970), 3 -Skopal et al (2000a), 4 -Skopal et al (2000b), 5 -Harmanec et al (1994), 6 -this paper, 7 -Skopal et al (2004), 8 -Henden & Munari (2001), 9 -Henden & Munari (2000. a Check star, b for RC, IC filters, c variable star of δ Sct type.…”

“…The star BD+47 • 4192 was used as the comparison. We adopted its brightness and colours within the UBV bands as in the Paper I, while for the R C and I C filters we used colours according to Henden & Munari (2006) …”

“…For the photoelectric photometry we used the same comparison star as in the Paper I. Our CCD measurements of BF Cyg were linked to the comparison star "a" of Henden & Munari (2006). eclipse, which was narrower and rectangular in the profile.…”

“…Our new photometry of CH Cyg is listed in Tables 7, 8 and 11. On the CCD snaps, CH Cyg was measured with respect to the standard star "b" of Henden & Munari (2006). The photometric low state was abandoned by two shortterm ∼1.5 mag brightening, observed during 2009 July and from 2009 September to the end of the year (Fig.…”

“…The quiescent phase continued to 2006 May, when CI Cyg started a new active phase with brightening by >2 mag in U (Paper I , Fig 9 here). Our new UBV measurements of CI Cyg are summarized in Tables 9, 10 Table 10 were obtained using the comparison stars "a" and "b" of Henden & Munari (2006).…”