VLBA determination of the distance to nearby star-forming regions VI. The distance to the young stellar object HW 9 in Cepheus A

Abstract

Using the Very Long Baseline Array (VLBA), we have observed the radio continuum emission from the young stellar object HW 9 in the Cepheus A star-forming region at ten epochs between 2007 February and 2009 November. Due to its strong radio variability, the source was detected at only four of the ten epochs. From these observations, the trigonometric parallax of HW 9 was determined to be $\pi$ = 1.43 $\pm$ 0.07 mas, in excellent agreement with a recent independent VLBA determination of the trigonometric parallax of a methanol maser associated with the nearby young stellar source HW 2 ($\pi$ = 1.43 $\pm$ 0.08 mas). This concordance in results, obtained in one case from continuum and in the other from line observations, confirms the reliability of Very Long Baseline Array trigonometric parallax measurements. By combining the two results, we constrain the distance to Cepheus A to be 700${}_{-28}^{+31}$ pc, an uncertainty of 3.5%.

Accepted for publication in the ApJ

References in corpus (3)

• VLBA determination of the distance to nearby star-forming regions I. The distance to T Tauri with 0.4% accuracy
• The X-Ray Origin of Herbig AeBe Systems: New Insights
• Searching for coronal radio emission from protostars using Very-Long-Baseline Interferometry

Cited by in corpus (37)

• The Role of Multiplicity in Disk Evolution and Planet Formation
• The observed spiral structure of the Milky Way
• Radio Jets from Young Stellar Objects
• Circumstellar Disk Lifetimes In Numerous Galactic Young Stellar Clusters
• VLBA determination of the distance to nearby star-forming regions V. Dynamical mass, distance and radio structure of V773 Tau A
• The (w)hole survey: an unbiased sample study of transition disk candidates based on Spitzer catalogs
• The Milky Way Spiral Structure Parameters from Data on Masers and Selected Open Clusters
• Subarcsecond Imaging of the NGC 6334 I(N) Protocluster: Two Dozen Compact Sources and a Massive Disk Candidate
• Galactic masers: kinematics, spiral structure and the disk dynamic state
• The SOFIA Massive (SOMA) Star Formation Survey. I. Overview and First Results
• The Gould Belt Very Large Array Survey IV: The Taurus-Auriga complex
• Star Formation In Nearby Clouds (SFiNCs): X-ray And Infrared Source Catalogs And Membership
• A kinematic study and membership analysis of the Lupus star-forming region
• Planar infall of CH3OH gas around Cepheus A HW2
• Collective outflow from a small multiple stellar system
• Redetermination of Galactic Spiral Density Wave Parameters Based on Spectral Analysis of Maser Radial Velocities
• Rotating and infalling motion around the high-mass young stellar object Cepheus A-HW2 observed with the methanol maser at 6.7 GHz
• Galactic Rotation Curve and Spiral Density Wave Parameters from 73 Masers
• Multi-Epoch VLBA Observations of the Compact Wind-Collision Region in the Quadruple System Cyg OB2 #5
• VLBA determination of the distance to nearby star-forming regions VII. Monoceros R2
• The local standard of rest from data on young objects with account for the Galactic spiral density wave
• A Highly collimated Water Maser Bipolar Outflow in the Cepheus A HW3d Massive Young Stellar Object
• The Gould Belt, the de Vaucouleurs-Dolidze Belt, and the Orion Arm
• Sun-Sized Water Vapor Masers in Cepheus A
• Detection of periodic variations in vertical velocities of Galactic masers
• 1.3mm polarized emission in the circumstellar disk of a massive protostar
• Determination of Galactic Rotation Parameters and the Solar Galactocentric Distance Ro from 73 Masers
• Parameters of the Radcliffe wave from masers, radio stars and T Tauri stars
• The compact, time-variable radio source projected inside W3(OH): Evidence for a Photoevaporated Disk?
• Millimeter Spectral Line Mapping Observations Toward Four Massive Star Forming HII Regions
• An Anomalous Extinction Law in the Cep OB3b Young Cluster: Evidence for dust processing during gas dispersal
• Discovery of ammonia (9,6) masers in two high-mass star-forming regions
• The Mysterious Radcliffe Wave
• Gas infall via accretion disk feeding Cepheus A HW2
• Dynamical masses of YSOs with the VLBA: DYNAMO VLBA: Trigonometric parallaxes and proper motions of YSOs in Orion
• A new estimate of the Local Standard of Rest from data on young Galactic objects
• Evidence for the gravity-driven and magnetically-regularized gas flows feeding the massive protostellar cluster in Cepheus A