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Space Telescope Science Institute

2018 Spring Symposium: The 21st Century H-R Diagram: The Power of Precision Photometry

Event Description

The Hertzsprung-Russell Diagram has revolutionized stellar physics over the past century. It remains an essential tool in the 21st century for studying stellar properties and behavior. New observing capabilities have improved precision and accuracy, which in turn have uncovered new populations of stars and revealed limits in our physical understanding of their structure and evolution. Now is the time to prepare for the next generation of facilities that will bring forward a new wave of diagnostics to analyze the Hertzsprung-Russell Diagram.

Please join us in Baltimore for the 2018 Spring Symposium. Discussions will include:

REGISTER for the symposium by following this link:

Space permitting, symposium talks are open to astronomers from all local (Maryland and Washington, DC) institutions without registering. However, seating is not guaranteed in the auditorium without registering for the symposium. Locals attending the symposium are requested to refrain from partaking in the refreshments provided. Locals wishing to partake in the refreshments will need to register and will receive a badge for admission after payment of the registration fee.

Special Talks

David DeVorkin, National Air and Space Museum
“The Origins of the HR Diagram in the ‘Great Correlation’ Era”

Peter Stetson, Dominion Astrophysical Observatory
“Early imaging photometry and the development of DAOPHOT”

Francesca D’Antona, Observatory of Rome
“A Half Century of Stellar Models”

Sofia Randich and Marcella Marconi
Highlights from Gaia Data Release 2

Special Events

Monday, April 23
Opening reception, immediately following the day’s talks

Wednesday, April 25
SDAS beer with STScI staff

Event Details

Daily Event Schedule:

Day Date Event Time
Monday April 23, 2018 Symposium 8:00am - 5:00pm
Tuesday April 24, 2018 Symposium 8:00am - 5:00pm
Wednesday April 25, 2018 Symposium 8:00am - 5:00pm
Thursday April 26, 2018 Symposium 8:00am - 1:00pm
Thursday April 26, 2018 CHARA Workshop* 2:00pm - 5:00pm

Conference Participants

Conference Agenda

Conference Booklet

*The CHARA Community Workshop will occur on Thursday afternoon after the conclusion of the symposium and is open to symposium participants if you wish to attend. There is no registration fee but you must register separately for this workshop. The CHARA workshop will provide tutorials on interferometry, the science capabilities of the CHARA Array, and how to prepare and apply for observing time. For more information or to register for the workshop, please follow the link:

CHARA Community Workshop
Milliarcsecond Astronomy with the CHARA Array
Space Telescope Science Institute
Thursday, April 26, 2018

TopicSpeakerLengthStart Time
Stellar Astrophysics at High Angular ResolutionGail Schaefer452:00 PM
Overview of the CHARA Array and Applying for TimeDouglas Gies452:45 PM
Planning Observations, Data Access, Software ToolsGail Schaefer453:30 PM
Open discussion to talk about ideas for observing programsAll454:15 PM
End of Workshop5:00 PM

Event Dates: April 23-26, 2018

Registration Fee: $200.00

Registration Opens: January 8, 2018

Registration Ends: March 23, 2018

NOTE: All registrations and payments must be confirmed by 11:59:59pm EST on Monday, March 23rd, 2018. Registration is not complete until payment of the registration fee.

Abstract Submission Deadline for Contributed Talks and Posters: February 1, 2018

Please submit your poster or talk abstract for consideration by completing the form found here.

Decisions on Contributed Talks communicated to submitters: March 1, 2018


Workshop Coordinator:

Scientific Organizing Committee:


STScI has reserved a block of rooms at the Doubletree Inn at the Colonnade, a hotel within walking distance of the Institute. For a special conference rate at the Colonnade, you may register online at 2018 Spring Symposium: The 21st Century H-R Diagram, Group Code S18 or you can call the Colonnade directly at 410-235-5400. Let your reservationist know you are with the 2018 Spring Symposium. Special reduced room rate is available through March 21, 2018. After that date, normal room rates will apply.

Confirmed Speakers

Confirmed speakers include:

Speaker Name Institution
Lars Bildsten University of California Santa Barbara
Jo Bovy University of Toronto
Adam Burgasser University of California San Diego
Marcella Di Criscienzo Osservatorio di Roma
Francesca D'Antona Osservatorio Astronomico di Roma
David DeVorkin Smithsonian National Air and Space Museum
Aaron Dotter Harvard-Smithsonian Center for Astrophysics
Carme Gallart Instituto de Astrofisica de Canarias
Karrie Gilbert Space Telescope Science Institute
Leo Girardi Osservatorio Astronomico di Padova
Gregory Herczeg Kavli Institute for Astronomy and Astrophysics
Marcella Marconi Osservatorio Astronomico di Capodimonte Naples
Kristen McQuinn University of Texas – Austin
Tom Megeath University of Toledo
Antonino Milone University of Padova
Pier Giorgio Prada Moroni University of Pisa
Marc Pinsonneault The Ohio State University
Sofia Randich Osservatorio Astrofisico di Arcetri
Alvio Renzini Osservatorio Astronomico di Padova
Elena Sabbi Space Telescope Science Institute
Robyn Sanderson California Institute of Technology
Peter Stetson National Research Council of Canada
Dan Weisz University of California Berkeley