On the crucial cluster Andrews-Lindsay 1 and a 4% distance solution for its planetary nebula

• Autores: Majaess, D.; Carraro, G.; Moni Bidin, C.; Bonatto, C.; Turner, D.; Moyano, M.; Berdnikov, L.; Giorgi, Edgard Ervar Salvador
• Año de publicación: 2014
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Ciencias Astronómicas; Open clusters and associations: individual: Andrews-Lindsay 1 (ESO 96-SC04); Planetary nebulae: individual: PHR 1315-6555
• Institución: Universidad Nacional de La Plata

Andrews-Lindsay 1 is a pertinent open cluster because it may host the planetary nebula (PN) PHR 1315-6555, yet ambiguities linger concerning its fundamental parameters (>50% scatter). New multiband BVJHW1 - 4 photometry for cluster and field stars, in concert with observations of recently discovered classical Cepheids, were used to constrain the reddening and velocity-distance profiles along the sightline. That analysis yielded the following parameters for the cluster: E(J - H) = 0.24 ± 0.03, d = 10.0 ± 0.4 kpc (dJH = 9.9 ± 0.6 kpc, dBV = 10.1 ± 0.5 kpc), and log τ = 8.90 ± 0.15. The steep velocity-distance gradient along ℓ ∼ 305° indicates that two remote objects sharing spatial and kinematic parameters (i.e., PHR 1315-6555 and Andrews-Lindsay 1) are associated, thus confirming claims that the PN is a cluster member. The new distance for PHR 1315-6555 is among the most precise established yet for a Galactic PN (σ/d = 4%).
Instituto de Astrofísica de La Plata