A Search for OB Associations Near Southern Long-Period Cepheids. V. AQ Puppis and V620 Puppis
David G. Turner, Sidney van den Bergh, Frank Younger, Daniel J., Majaess, Mario H. Pedreros, Leonid Berdnikov

TL;DR
This study investigates the stellar environment around the Cepheids AQ Puppis and V620 Puppis, determining their distances, reddening, and possible cluster memberships, revealing insights into their evolutionary states and period changes.
Contribution
It provides new photometric data, identifies potential star clusters associated with the Cepheids, and analyzes their properties and evolutionary implications.
Findings
AQ Pup is likely part of a cluster at 3.21 kpc with high luminosity.
V620 Pup is associated with a cluster at 2.88 kpc and is possibly a first crossing Cepheid.
AQ Pup exhibits an unusually rapid period increase, suggesting high mass loss or a fifth crossing.
Abstract
A photometric UBV survey is presented for 610 stars in a region surrounding the Cepheid AQ Puppis and centered southwest of the variable, based upon photoelectric measures for 14 stars and calibrated iris photometry of photographic plates of the field for 596 stars. An analysis of reddening and distance for program stars indicates that the major dust complex in this direction is ~1.8 kpc distant, producing differential extinction described by a ratio of total-to-selective extinction of R=Av/E(B-V)=3.10+-0.20. Zero-age main-sequence fitting for the main group of B-type stars along the line of sight yields a distance of 3.21+-0.19 kpc (Vo-Mv=12.53+-0.13 s.e.). The 29.97d Cepheid AQ Pup, of field reddening E(B-V)=0.47+-0.07 (E(B-V)(B0)=0.51+-0.07), appears to be associated with B-type stars lying within 5' of it as well as with a sparse group of stars, designated Turner 14, centered south…
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