Stellar Variability, Stellar Multiplicity: Periodicity in Time & Motion
MW-GAIA WG2 Hybrid Workshop
Sofia, 6-8 June 2023

Stellar variability, intrinsic as in pulsating stars and extrinsic as in binaries, plays a crucial role in many fields of astrophysics, from stellar evolution, to the distance scale, to the study of structure and formation of the Milky Way. Gaia DR3 published light curves and characteristic parameters for about 10.5 million variable sources. This number is expected to increase by an order of magnitude in DR4. The workshop will focus on the impact that Gaia is having on a number of different fields addressed by stellar variability

The workshop will focus on the impact that Gaia is having on a number of different fields addressed by stellar variability. The meeting is part of the project “Revealing the Milky Way with Gaia” (MW-Gaia) funded by a COST (European Cooperation in Science and Technology) Union action.

Important Dates

10 March 2023 - Registration and submission of abstracts begin

08 May 2023 - Extended Deadline for registration
08 May 2023 - Extended Deadline for the submission of abstracts
20 May 2023 - Extended Deadline to pay the workshop fee
22 May 2023 - Announcement of the scientific program
06 June 2023 - The workshop starts
08 June 2023 - The workshop ends

Gisella Clementini
     Ivanka Stateva
Laurent Eyer
     Fran Jimenez-Esteban
Pierre Kervella
  Ilaria Musella
Sergio Simon-Diaz
  Laszlo Szabados
Robert Szabo
  Svetla Tsvetkova
Ivanka Stateva   Svetla Tsvetkova
Renada Konstantinova-Antova   Kiril Stoyanov
Momchil Dechev   Luba Dankova


The Conference will take place in Auditorium 3 (floor 1), Laboratory complex of Sofia Tech Park, Sofia. Address: 111, Tsarigradsko Shosse Blvd., 1784 Sofia

How to get Sofia:
By flight:

The Sofia Airport is well-connected with most European capital cities through more than 30 flights by the national flag carriers as well as some low-cost companies. Located in the eastern zone of the city, the airport is only a 10 km drive from the city’s center. The public bus on lines 84 and 184 connect the T1 and T2 Terminals of the airport with the city center. You can use also the metro system. Metro line M4 goes from the airport Terminal 2 to the city center. The metro stop is just next to the exit of the airport Terminal 2. It is the first stop of the metro line. It takes about 20-30 mins to reach the center stop Serdika. The ticket costs 1.60 lv. and it can be bought/purchased from a lady at a pay desk or from a self-service machine. No metro line stops close to SofiaTechPark.

By bus:

When you come to Sofia by train or bus you will arrive at the same location. The Central Train Station of Sofia, the Central Bus Station and the International Bus station are located next to each other. From there you can use the public transport or you can get a taxi to your hotel or point of interest. Sofia is connected with cities like Kiev, Istanbul, Vienna, Belgrade and Bucharest by direct train services. The central bus station runs buses to and from many national as well as international cities such as Istanbul, Belgrade, Vienna and Nis. There are also services to several Greece and North Macedonian cities.

By car:

To get to Sofia by car you will enter the capital of Bulgaria trough one of four major routes: - from Serbia you should cross the border at Kalotina then after 60 kilometers you will reach Sofia at its west end.
- from Greece you will cross the border at Kulata and then you need to follow road E79 which continues as A3 highway.
- from Romania you will enter Sofia from north-east trough Hemus highway.
- from Turkey you will arrive to Sofia by using Trakya highway which turns into Tzarigradsko shose Blvd.

Public transport in Sofia:

From/To City center - SofiaTechPark:

– Buses 306, 184 and 84 and trolleybuses 5 and 8, stop "Sofia Tech Park" (in the direction of Mladost)
- Buses 1, 3, 5 and 6, "Sofia Tech Park" stop (in the local lane on "Tsarigradsko shose" blvd., direction "Center")
- Buses 1, 3, 5, 6, 280, 294, 305 and 306 and trolleybuses 4, 5, 8 and 11, "Aviation Square" stop. Pedestrian access is available from Aviation Square, as well as via a pedestrian bridge over Tsarigradsko Shose Blvd.
Buses 84 (from Terminal 1 and 2) and 184 (from Terminal 1 and 2) also stop at SofiaTechPark.


Here we propose a list of hotels located close to the workshop venue:

Metropolitan hotel
address: 64, Tsarigradsko Chaussee blvd., Sofia 1784
phone: +359 2 424 79 00, -01, -02

hotel Novotel Sofia
address: 115 N,Tsarigradsko Chaussee Blvd, Sofia 1784
phone: +35929043000

hotel of Bulgarian Academy of Sciences
address: 50 “Shipchenski prohod” blvd., Sofia 1113 phone: +359 2 8702140; +359 2 8710009; +359 875 205115

hotel Rai
6 Akademik Nikola Obreshkov Str., Geo Milev, 1113 Sofia


hotel Europe
address: 1, Liditse Str., Sofia 1113
phone: 359 879209300; +359 2 970 15 00

hotel Kibella
address: 26, Alexander von Humboldt str., Geo Milev, 1113 Sofia
phone: +359 2 971 38 15; +359 888 588 575

ATM hotel
address: Tsarigradsko Chaussee Blvd. 131, 1784 Sofia
phone: +359 2 965 8481

SofiaTechPark hostel
address: Tsarigradsko Chaussee Blvd 111 B, Incubator Building
phone: +359 889 900 602; +359 889 900 627


The number of (non-invited) participants is limited to about 40. If there are more applications, the selection of participants will be based on the relevance of the proposed abstract, the importance of the workshop for the advancement of the career of the applicant as well as diversity (in gender, country, etc). As with all COST actions, early-career scientists are given priority.

There is some limited funding available to support participants. Our MW-Gaia Action is following the COST organisation’s inclusiveness policies and will evaluate requests for support against these criteria and the applicants statement as to why their attendance at the workshop will be beneficial to them and/or the other conference participants

Registration Fee:

The registration fee will cover the welcoming reception, coffee-breaks and buffet lunches.
The workshop registration fee is 70 Euro (without social dinner) or 110 Euro (with social dinner).

The fee is due only for participation in person and not for remote participation.

The fee should be paid by bank transfer.

The bank details are:
UniCredit Bulbank
IBAN: BG89UNCR96603119902810
Institute of Astronomy with NAO

IMPORTANT! Please put the following text in the field ‘Reason forpayment’:
Registration fee for MW-GAIA WG2 workshop, Sofia

Registration Closed.

Contact Us

Institute of Astronomy with NAO
72, Tsarigradsko Chaussee, Blvd.
Sofia, Bulgaria
post code: 1842